Propogation Of Sound Waves Exercise 8a
Please Select
Q1 What causes sound?
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Q2 What is sound? How is it produced
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Q3 Complete the following sentence:
Sound is produced by a ____________ body
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Q4 Describe a simple experiment that demonstrates that the sound produced by a tuning fork is due to vibrations of its arms.
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Q5 Describe in brief, with the aid of a labelled diagram, an experiment to demonstrate that a material medium is necessary for the propagation of sound
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Q6 There is no atmosphere on the moon. Can you hear each other on the moon’s surface?
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Q7 State three characteristics of the medium required for propagation of sound in a medium.
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Q8 Explain with an example, the propagation of sound in a medium.
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Q9 Choose the correct word/words to complete the following sentence:
When sound travels in a medium __________ (the particles of the medium, the source, the disturbance, the medium) travels in form of a wave
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Q10 Name the two kinds of waves in form of which sound travels in a medium
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Q11 What is a longitudinal wave? In which medium: solid, liquid or gas, can it be produced?
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Q12 What is a transverse wave? In which medium: solid, liquid or gas, can it be produced?
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Q13 Explain the meaning of terms compression and rarefaction in relation to a longitudinal wave.
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Q14 Explain the terms crest and trough in relation to a transverse wave.
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Q15 Describe an experiment to show that in a wave motion, only energy is transferred, but particles of medium do not leave their positions
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Q16 Define the term amplitude of a wave. Write its S.I. unit
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Q17 What do you mean by the term frequency of a wave? State its S.I. unit
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Q18 How is the frequency of a wave related to its time period?
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Q19 Define the term wave velocity. Write its S.I. unit
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Q20 Draw a displacement-time graph of a wave and show on it the amplitude and time period of the wave.
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Q21 Draw a displacement-distance graph of a wave and mark on it, the amplitude of the wave by the letter a and wavelength of the wave by the letter λ.
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Q22 How is the wave velocity V, frequency f, and wavelength λ of a wave related? Derive the relationship
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Q23 State two properties of the medium on which the speed of sound in it depends
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Q24 Arrange the speed of sound in gases Vg, solids Vs, and liquids Vl in an ascending order
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Q25 State the speed of (i) light and (ii) sound in air?
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Q26 Compare approximately the speed of sound in air, water and steel
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Q27 Answer the following:
(i) Can sound travel in a vacuum?
(ii) How does the speed of sound different in different media?
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Q28 Flash of lightning reaches us earlier than the sound of thunder. Explain the reason
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Q29 If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why?
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Q30 The sound of an explosion on the surface of a lake is heard by a boat man 100m away and by a diver 100m below the point of explosion.
(i) Who would hear the sound first: boat man or diver?
(ii) Give a reason for your answer in part (i)
(iii) If sound takes time t to reach the boat man, how much time approximately does it take to reach the diver
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Q31 How do the following factors affect, if at all, the speed of sound in air:
(i) Frequency of air
(ii) Temperature of air
(iii) Pressure of air
(iv) Moisture in air?
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Q32 How does the speed of sound change with change in (i) amplitude and (ii) wavelength, of sound wave?
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Q33 In which medium the speed of sound is more: humid air or dry air? Give a reason for your answer.
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Q34 How does the speed of sound in air vary with temperature?
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Q35 Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you?
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Q36 Complete the following sentences:
(a) Sound cannot travel through _________ but it requires a _____________
(b) When sound travels in a medium, the particles of medium __________ but the disturbance
(c) A longitudinal wave is composed of compression and _____________
(d) A transverse wave is composed of crest and _____________
(e) Wave velocity = ____________ x wavelength
Solution :
Mutltiple Choice Questions
Q1 The correct statement is:
(a) Sound and light both require a medium for propagation
(b) Sound can travel in a vacuum, but light cannot
(c) Sound needs a medium, but light does not need a medium for its propagation
(d) Sound and light both can travel in vaccum
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Q2 The speed of sound in air at 0 ° is nearly:
(a) 1450 m/s
(b) 450 m/s
(c) 5100 m/s
(d) 330 m/s
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Q3 Sound in air propagates in form of:
(a) Longitudinal wave
(b) Transverse wave
(c) Both longitudinal and transverse wave
(d) Neither longitudinal nor transverse wave
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Q4 The speed of light in air is:
(a) 3 x 108 m/s
(b) 330 m/s
(c) 5100 m/s
(d) 3 x 1010 m/s
Solution :
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