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What type of mirror is used to obtain a real image-of an object?
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Complete the following sentence :
Sound is produced by a ___________ body.
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What is a transverse wave? In which medium: solid, liquid or gas, can it be produced?
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Explain meaning of the terms compression and rarefaction in relation to a longitudinal wave.
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Define the term amplitude of a wave. Write its S.I. unit.
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What do you mean by the term frequency of a wave? State its S.I. unit.
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Define the term wave velocity. Write its S.I. unit.
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Draw displacement-time graph of a wave and show on it the amplitude and time period of wave.
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Draw a displacement-distance graph of a wave and mark on it, the amplitude of wave by the letter 'a' and wavelength of wave by the letter λ.
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How are the wave velocity V, frequency f and wavelength λ of a wave related? Derive the relationship.
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Arrange the speed of sound in gases Vg, solids Vs and liquids VLin an ascending order.
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State the speed of (i) light and (ii) sound in air?
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Answer the following question :
Can sound travel in vacuum?
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The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
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In which medium the speed of sound is more: humid air or dry air? Give a reason to your answer.
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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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Complete the following sentences :
Sound cannot travel through __________, but it requires a ___________.
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Complete the following sentences :
Wave velocity = ________________ × wavelength.
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