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      Class 9 Science

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      • Class 09
      • Class 9 Science
      CoursesClass 09ScienceClass 9 Science
      • 01.Matter in Our Surroundings
        9
        • Lecture1.1
          Matter and Its Properties 39 min
        • Lecture1.2
          States of Matter and Compressibility & Rigidity 21 min
        • Lecture1.3
          Moving through, Fluidity, Density, Diffusion, Pressure 26 min
        • Lecture1.4
          Change of State of Matter 56 min
        • Lecture1.5
          Evaporation and Boiling 39 min
        • Lecture1.6
          Cooling Effect of Evaporation Two More States of Matter 22 min
        • Lecture1.7
          Chapter Notes – Matter in Our Surroundings
        • Lecture1.8
          NCERT Solutions – Matter in Our Surroundings
        • Lecture1.9
          Revision Notes Matter in Our Surroundings
      • 02.Is Matter Around Us Pure
        9
        • Lecture2.1
          Elements and Compounds 20 min
        • Lecture2.2
          Mixtures, Homogeneous & Heterogeneous and Chemical & Physical Change 37 min
        • Lecture2.3
          Solution, Suspension, Colloid and Tyndal Effect 48 min
        • Lecture2.4
          Terms related to Solution and Solubility 42 min
        • Lecture2.5
          Separation of Mixtures 47 min
        • Lecture2.6
          Cleaning Drinking Water and Classification of Matter 29 min
        • Lecture2.7
          Chapter Notes – Is Matter Around Us Pure
        • Lecture2.8
          NCERT Solutions – Is Matter Around Us Pure
        • Lecture2.9
          Revision Notes Is Matter Around Us Pure
      • 03.Atoms and Molecules
        7
        • Lecture3.1
          Atom and its Properties, Atomic Mass, Molecule and Molecular Mass 40 min
        • Lecture3.2
          Ions, Valency and Writing the formulae of Compounds 47 min
        • Lecture3.3
          Mole Concept 42 min
        • Lecture3.4
          Calculation of no. of Moles, Percentage of an Element in a Compound and Laws of Chemical Combination 30 min
        • Lecture3.5
          Chapter Notes – Atoms and Molecules
        • Lecture3.6
          NCERT Solutions – Atoms and Molecules
        • Lecture3.7
          Revision Notes Atoms and Molecules
      • 04.Structure of The Atom
        7
        • Lecture4.1
          Charged Particles in Matter and Discovery of Sub – atomic Particles 31 min
        • Lecture4.2
          Atomic Model by J.J Thomson’s Model and Rutherford 57 min
        • Lecture4.3
          Ion, Mass Number, Isotopes, Isobar and Fractional Mass number of Elements 01 hour
        • Lecture4.4
          Electron Distribution in Orbits and Valency 01 hour
        • Lecture4.5
          Chapter Notes – Structure of The Atom
        • Lecture4.6
          NCERT Solutions – Structure of The Atom
        • Lecture4.7
          Revision Notes Structure of The Atom
      • 05.Cell - Fundamental Unit of Life
        7
        • Lecture5.1
          Introduction to Cell and Its Structure – Cell Wall 31 min
        • Lecture5.2
          Cell Membrane, Cytoplasm, Nucleus 32 min
        • Lecture5.3
          Ribosomes, Endoplasmic Reticulum, Golgi bodies, Lisosomes, Mitocondria 38 min
        • Lecture5.4
          Plastids, Vacuole; Types of Cell and Transport through Plasma Membrane 33 min
        • Lecture5.5
          Chapter Notes – Cell – Fundamental Unit of Life
        • Lecture5.6
          NCERT Solutions – Cell – Fundamental Unit of Life
        • Lecture5.7
          Revision Notes Cell – Fundamental Unit of Life
      • 06.Tissues
        8
        • Lecture6.1
          Division of Labour, Plant Tissues – Merismatic Tissue 20 min
        • Lecture6.2
          Plant Tissue-Permanent Tissue: Simple Permanent Tissue 34 min
        • Lecture6.3
          Plant Tissue-Permanent Tissue: Complex and Protective Tissue 31 min
        • Lecture6.4
          Animal Tissue- Muscular Tissue and Nervous Tissue 27 min
        • Lecture6.5
          Animal Tissue- Connective Tissue and Epithelial Tissue 42 min
        • Lecture6.6
          Chapter Notes – Tissues
        • Lecture6.7
          NCERT Solutions – Tissues
        • Lecture6.8
          Revision Notes Tissues
      • 07.Diversity in Living Organisms
        8
        • Lecture7.1
          Introduction to Biodiversity and Classification, Nomenclature 35 min
        • Lecture7.2
          The Five Kingdoms 29 min
        • Lecture7.3
          Plantae Kingdom 42 min
        • Lecture7.4
          Animalia Kingdom 01 hour
        • Lecture7.5
          Classification of Chordates and Revision of Animalia Kingdom 33 min
        • Lecture7.6
          Chapter Notes – Diversity in Living Organisms
        • Lecture7.7
          NCERT Solutions – Diversity in Living Organisms
        • Lecture7.8
          Revision Notes Diversity in Living Organisms
      • 08.Motion
        11
        • Lecture8.1
          Straight Line Motion, Position, Vector and Scalar; 23 min
        • Lecture8.2
          Distance & Displacement 48 min
        • Lecture8.3
          Speed and Velocity 57 min
        • Lecture8.4
          Acceleration and Deacceleration, Uniform & Non-uniform Acceleration 47 min
        • Lecture8.5
          Equations of Uniformly Accelerated Motion 58 min
        • Lecture8.6
          Uniform Circular Motion 30 min
        • Lecture8.7
          Graphical representation of Motion 30 min
        • Lecture8.8
          Calculations Using Graph 28 min
        • Lecture8.9
          Chapter Notes – Motion
        • Lecture8.10
          NCERT Solutions – Motion
        • Lecture8.11
          Revision Notes Motion
      • 09.Force and Newtons Laws of Motion
        12
        • Lecture9.1
          Force and Net or Resultant Force 46 min
        • Lecture9.2
          Newton’s 1st Law 46 min
        • Lecture9.3
          Momentum 46 min
        • Lecture9.4
          Newton’s 2nd Law 27 min
        • Lecture9.5
          Newton’s 2nd Law in Terms of Acceleration; 42 min
        • Lecture9.6
          Newton’s 1st Law from 2nd law and Practical Examples of Newton’s 2nd Law 42 min
        • Lecture9.7
          Newton’s 3rd Law and its Practical Examples 35 min
        • Lecture9.8
          Conservation of Momentum 33 min
        • Lecture9.9
          Practical Applications of Conservation of Momentum 29 min
        • Lecture9.10
          Chapter Notes – Force and Newtons Laws of Motion
        • Lecture9.11
          NCERT Solutions – Force and Newtons Laws of Motion
        • Lecture9.12
          Revision Notes Force and Newtons Laws of Motion
      • 10.Gravitation
        9
        • Lecture10.1
          Universal Law of Gravitation and Free Fall 41 min
        • Lecture10.2
          Falling Bodies: case 1 46 min
        • Lecture10.3
          Falling bodies: case 2 and Air Resistance 42 min
        • Lecture10.4
          Value of g, Mass and Weight, Weight on Moon, Circular Motion and Gravitation 48 min
        • Lecture10.5
          Thrust and Pressure and Pressure in fluids 37 min
        • Lecture10.6
          Archimedes Principle; Density 37 min
        • Lecture10.7
          Chapter Notes – Gravitation
        • Lecture10.8
          NCERT Solutions – Gravitation
        • Lecture10.9
          Revision Notes Gravitation
      • 11.Work and Energy
        7
        • Lecture11.1
          Work and Workdone Against Gravity, Oblique Displacement 01 hour
        • Lecture11.2
          Energy and Different Forms of Energy, Derivation of Formulae of K.E. 58 min
        • Lecture11.3
          Transformation of Energy and Law of Conservation of Energy 01 hour
        • Lecture11.4
          Rate of doing Work and Commercial Unit of Energy 43 min
        • Lecture11.5
          Chapter Notes – Work and Energy
        • Lecture11.6
          NCERT Solutions – Work and Energy
        • Lecture11.7
          Revision Notes Work and Energy
      • 12.Sound
        8
        • Lecture12.1
          Production and Propagation of Sound and Medium for Sound 30 min
        • Lecture12.2
          Frequency and Velocity of Sound Wave, Characteristic of Sound 01 hour
        • Lecture12.3
          Sonic Boom, Light faster than Sound, Reflection of Sound, Echo and Reverberation 56 min
        • Lecture12.4
          Types of Sound Based on Frequency 42 min
        • Lecture12.5
          Human Ear and Intensity of Sound 25 min
        • Lecture12.6
          Chapter Notes – Sound
        • Lecture12.7
          NCERT Solutions – Sound
        • Lecture12.8
          Revision Notes Sound
      • 13.Why do We Fall Ill
        7
        • Lecture13.1
          Factors Determining Health, Disease, Look of Disease, Cause of Disease, Types of Diseases 24 min
        • Lecture13.2
          Infectious Diseases, Immune System, Treatment of Diseases 55 min
        • Lecture13.3
          Prevention from Disease, Vaccination – Immunisation 36 min
        • Lecture13.4
          AIDS, Different Modes for Different Diseases 18 min
        • Lecture13.5
          Chapter Notes – Why do We Fall Ill
        • Lecture13.6
          NCERT Solutions – Why do We Fall Ill
        • Lecture13.7
          Revision Notes Why do We Fall Ill
      • 14.Natural Resources
        7
        • Lecture14.1
          Natural Resource-Air and its Pollution 57 min
        • Lecture14.2
          Natural Resource-Water and Soil and its Pollution 49 min
        • Lecture14.3
          Biogeochemical Cycles 33 min
        • Lecture14.4
          Green House Effect, Global Warming and Ozone Layer Depletion 30 min
        • Lecture14.5
          Chapter Notes – Natural Resources
        • Lecture14.6
          NCERT Solutions – Natural Resources
        • Lecture14.7
          Revision Notes Natural Resources
      • 15.Improvements in Food Resources
        7
        • Lecture15.1
          Various Revolution Held in India; Types of Crops; Crop Season; Crop Variety Improvement 31 min
        • Lecture15.2
          Crop Production Improvement 45 min
        • Lecture15.3
          Crop Protection Improvement and Organic Farming 29 min
        • Lecture15.4
          Animal Husbandry 40 min
        • Lecture15.5
          Chapter Notes – Improvements in Food Resources
        • Lecture15.6
          NCERT Solutions – Improvements in Food Resources
        • Lecture15.7
          Revision Notes Improvements in Food Resources

        NCERT Solutions – Sound

        Intext Questions

        Q.1     How does the sound produced by a vibrating object in a medium reach your ear?
        Sol.   When a body vibrates the air in its neighborhood is alternately compressed and rarefied. The compressed air has higher pressure than surrounding air. It therefore pushes the air particles near it causing compression to move forward. A rarefaction or low pressure is created at the original place. These compressions and rarefaction causes particles in the air to vibrate about their mean position. The energy is carried forward in these vibration. This is how sound travels.

        222222

         


        Page 163

        Q.1    Explain how sound is produced by your school bell?
        Sol.     When the gong strikes the bell, vibrations are produced in the bell which are transmitted through the air to our ears . These vibration produce sensation of sound in our ears.


        Q.2     Why are sound waves called mechanical waves?
        Sol.       Sound waves are called mechanical waves because they need a material medium to travel.


        Q.3     Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?
        Sol.       On the moon, sound cannot travel as there is no atmosphere. Sound cannot travel in vacuum so we will not be able to hear any sound.


        Page 166

        Q.1     Which waves property determines (a) loudness (b) pitch?
        Sol.       (i) Loudness is determined by the amplitude of the sound. Greater the amplitude more will be the loudness .
        (ii) Pitch is determined by frequency. Higher is the frequency, greater will be the pitch.


        Q.2     Guess which sound has a higher pitch : guitar or car horn?
        Sol.       Guitar


        Page 166

        Q.1      What are wavelength, frequency, time period and amplitude of a sound wave?
        Sol.      Wavelength : The distances between two consecutive compressions or rarefaction of a wave. Its S.I unit is meter.
                       Frequency : One compression and one rarefaction constitutes one vibration. The number of vibration in a second is called frequency. Its unit is Hertz.
                    Amplitude : When waves are produced, the particles vibrate about their mean position. The maximum displacement from its mean position of a particle is called its amplitude. It is measured in meters.
                    Time period : The time taken by the wave to complete one oscillation i.e., the time between two consecutive compressions or rarefactions is called time period.


        Q.2     How are the wavelength and frequency of a sound wave related to its speed?
        Sol.           Speed = Wavelength x frequency
                             V=λ×ν


        Q.3     Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
        Sol.      ν=220Hz,V=440m/s
        λ=Vν=440220=2m


        Q.4      A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
        Sol.      ν= 500 Hz.
        Therefore T=1500=.002s


        Page 166

        Q.1     Distinguish between loudness and intensity of sound ?
        Sol.      Loudness and intensity both depend upon the amplitude of sound.
        But loudness is the physiological response of our ears to a particular frequency. Our ears are more sensitive to some frequencies as compared to others. Intensity is the amount of sound energy passing per second per unit area. It is proportional to square of amplitude.


        Page 167

        Q. 1     In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
        Sol.       Sound travels faster in iron and slowest in air.


        Page 168

        Q.1     An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342ms−1 ?
        Sol.      Time for echo = 3 s
        v = 342 m/s
        V=2dt
        Therefore d=V×t2=342×32=513m.


        Page 169

        Q.1     Why are the ceilings of concert halls curved?
        Sol.      The ceilings of concert halls are curved so that after reflections from the surface , sound can reach each and every part of the hall.


        Page 170

        Q.1     What is the audible range of the average human ear?
        Sol.      Audible range 20Hz−20,000Hz


        Q.2     What is the range of frequencies associated with (a) Infra sound? (b) Ultrasound?
        Sol.      (a) Infra-sound less than 20 Hz
        (b) Ultra-sound greater than 20, 000 Hz.


        Page 172

        Q.1     A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?
        Sol.       t = 1.02 s , v = 1531 m/s
        d=v×t2=1531×1.022=780.81m

        Exercise

        Q.1     What is sound and how is it produced?
        Sol.      Sound is a form of energy which gives the sensation of hearing. It is produced by the vibrations caused in air by vibrating objects.


        Q.2     Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound?
        Sol.      When a body vibrates the air in its neighborhood is alternately compressed and rarefied. The compressed air has higher pressure than surrounding air. It therefore pushes the air particles near it causing compression to move forward. A rarefaction or low pressure is created at the original place. These compressions and rarefaction causes particles in the air to vibrate about their mean position. The energy is carried forward in these vibration. This is how sound travels.

        222222

         


        Q.3     Cite an experiment to show that sound needs a material medium for its propagation?
        Sol.      Sound waves are called mechanical waves as they need a material medium to travel.
        Take an electric bell and an air tight glass bell jar connected to a vacuum pump. Suspend the bell inside the jar, and press the switch of the bell. You will be able to hear the bell ring. Now pump out the air from the glass jar. The sound of the bell will become fainter and after some time, the sound will not be heard. This is so because almost all air has been pumped out.This shows that sound needs a material medium to travel.

        122

        Q.4     Why is sound wave called a longitudinal wave?
        Sol.      Sound wave is called longitudinal wave because it is produced by compressions and rarefactions in the air. The air particles vibrates parallel to the direction of propagation.


        Q.5     Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
        Sol.      The quality or timber of sound enables us to identify our friend by his voice.


        Q.6     Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
        Sol.      Thunder is heard after the flash of light is seen because sound and light travel at different speed. Light travels at the speed of about 3×108m/s whereas sound travels at about 300 m/s.


        Q.7     A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m/s.
        Sol.      λ1=Vν=34420=17.2m
        λ2=Vν=34420,000=.0172m


        Q.8     Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
        Sol.     Velocity of sound wave in air = 346 m/s
        Velocity of sound wave in aluminium = 6420 m/s
        Let length of rod be l.
        Time taken for sound wave in air t1=lvelocityinair
        Time taken for sound wave in Aℓt2=lvelocityinAluminium
        Therefore t1t2=velocityinAℓvelocityinair=6420346=18.55:1


        Q.9     The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
        Sol.      ν=100Hz=100vib/sec
        Therefore vibrations in 1 min = 100 × 60 = 6000 vibrations.


        Q.10     Does sound follow the same laws of reflection as light does? Explain.
        Sol.        Sound follows the same laws of refection as light. Sound is reflected by hard surfaces and it can be shown that ∠ofincidence=∠ofreflection


        Q.11    When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
        Sol.        An echo is heard when the time for the reflected sound is heard after 0.1 s.
        Timetaken=Totaldistancevelocity.
        On a hotter day the velocity of sound is more. If the time taken by echo is less than 0.1 sec it will not be heard.


        Q.12     Give two practical applications of reflection of sound waves ?
        Sol.        Two practical applications of reflection of sound waves are –
        (a) Megaphones or loud hailers are designed to send sound in a particular direction.
        (b) Stethoscope are based on the principal of multiple reflection of sound within the stethoscope tube enabling the doctor to hear a patient’s heartbeat.


        Q.13     A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10m/s2 square and speed of sound = 340 m/s .
        Sol.        Height of tower = 500 m
        Acceleration due to gravity = 10m/s2
        Speed of sound = 340 m/s
        Time for the stone to reach the water surface.
        t1=2hg−−√=2×50010−−−−−√=10s [h=ut+12gt2whereu=0]
        Time for sound of splash to reach the top
        t2=DistanceVelocity=500340=1.47s
        Therefore Total time t1+t2=11.47s


        Q.14     A sound wave travels at a speed of 339 m/s . If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
        Sol.        Velocity = 339 m/s
        λ=1.5cm=1.5×10−2m
        ν=Vλ=3391.5×10−2=22600Hz
        It will not be audible as human range is up to 20,000 Hz only.


        Q.15    What is reverberation? How can it be reduced ?
        Sol.        The persistence of sound due to its repeated reflection until it is not audible is called reverberation. It can be reduced by covering walls and roof of halls by sound absorbent material like compressed fiberboard, rough plaster or draperies.


        Q.16     What is loudness of sound? What factors does it depend on?
        Sol.        Loudness is the physiological response of our ears to sound. It depends on amplitude and frequency and also age of the person. Human beings can hear sound of frequency between 20 Hz to 20,000 Hz.


        Q.17     Explain how bats use ultrasound to catch a prey ?
        Sol.        Bats emit ultrasound. These are reflected by various obstacles and return to the bat’s ear. The nature of reflection tells the bat where the obstacles or prey is and accordingly the bat is able to catch its prey.


        Q.18      How is ultrasound used for cleaning?
        Sol.         Ultrasound are high frequency waves. Objects to be cleaned are placed in a cleansing solution and ultrasonic waves are passed. The continuous high frequency vibration cause the dust, grime etc. to detach from the object and can then be easily washed away.


        Q.19     Explain the working and application of a sonar ?
        Sol.        SONAR stands for Sound, Navigation And Ranging. It is a device used to measure distance, direction and speed of underwater objects. It has a transmitter and detector near its base. The transmitter transmits ultrasonic signals which get reflected by various underwater objects. These are received by the detector which can convert these waves into appropriate electrical signals and give us the required information.


        Q.20     A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
        Sol.        Time = 5 s for echo to return
        Distance of object = 3625 m
        V=2×dt=2×36255=1450m/s


        Q.21     Explain how defects in a metal block can be detected using ultrasound ?
        Sol.        Ultrasound is passed through the metal block which has to be tested. In case of flaws ultrasound does not pass through it but is reflected back. A detector on the other side of the block does not receive all the transmitted waves and hence the flow is detected .

        2222

         


        Q.22     Explain how the human ear works ?
        Sol.        The human ear consists of three parts – the outer ear, middle ear and inner ear.
        Outer ear : This is also called ‘pinna’. It collects the sound from the surrounding and directs it towards auditory canal.
        Middle ear : The sound reaches the end of the auditory canal where there is a thin membrane called eardrum or tympanic membrane. The sound waves set this membrane to vibrate. These vibrations are amplified by three small bones- hammer, anvil and stirrup. Inner ear : These vibration reach the cochlea in the inner ear and are converted into electrical signals which are sent to the brain by the auditory nerve, and the brain interprets them as sound.

        333

        Exemplar

        Multiple Choice Questions

        Q.1 Note is a sound

        (a) Of mixture of several frequencies

        (b) Of mixture of two frequencies only

        (c) Of a single frequency

        (d) Always unpleasant to listen

        Sol. (a)


        Q.2 A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case

        (a) Sound will be louder but pitch will not be different

        (b) Sound will be louder and pitch will also be higher

        (c) Sound will be louder but pitch will be lower

        (d) Both loudness and pitch will remain unaffected

        Sol. (d)


        Q.3 In SONAR, we use

        (a) Ultrasonic waves

        (b) Infrasonic waves

        (c) Radio waves

        (d) Audible sound waves

        Sol. (a)


        Q.4 Sound travels in air if

        (a) Particles of medium travel from one place to another

        (b) There is no moisture in the atmosphere

        (c) Disturbance moves

        (d) Both particles as well as disturbance travel from one place to another.

        Sol. (c)


        Q.5 When we change feeble sound to loud sound we increase its

        (a) Frequency

        (b) Amplitude

        (c) Velocity

        (d) Wavelength

        Sol. (b)


        Q.6 In the curve (Figure) half the wavelength is

        (a) A B

        (b) B D

        (c) D E

        (d) A E

        Sol. (d)


        Q.7 Earthquake produces which kind of sound before the main shock wave begins

        (a) Ultrasound

        (b) Infra sound

        (c) Audible sound

        (d) None of the above

        Sol. (b)


        Q.8 Infra sound can be heard by

        (a) Cow

        (b) Bat

        (c) Rhinoceros

        (d) Human beings

        Sol. (c)


        Q.9 Before playing the orchestra in a musical concert, a sit artist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting

        (a) Intensity of sound only

        (b) Amplitude of sound only

        (c) Frequency of the sitar string with the frequency of other musical instruments

        (d) Loudness of sound

        Sol. (c)

         

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