Same chapter3 marksDifficulty: Medium
A ship sends a sound signal towards the sea bed and receives the echo after 3 s. If the speed of sound in sea water is 1500 m s−1, find the depth of the sea.
Sound
3 marksDifficulty: Medium
On what factors does the loudness of a sound depend, and on what does its pitch depend?
Original Khojo Papers practice question — not from a past board paper.
Answer
The loudness depends chiefly on the amplitude of the vibration, and also on the surface area of the vibrating body and the distance of the listener from the source. The pitch depends on the frequency of the vibration: the higher the frequency, the higher the pitch.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Two sounds of the same pitch and loudness from different instruments differ in quality, which depends on the overtones present.
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Same chapter3 marksDifficulty: Medium
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A person claps and hears the echo from a cliff after 2 seconds. If the speed of sound is 340 m s−1, find the distance of the cliff.
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For an echo to be heard distinctly, the reflecting surface must be at least:
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