Advertisements
Advertisements
Question
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
Advertisements
Solution
The echo will not be heard because the minimum distance between the source and the reflecting surface should be 17 m.
RELATED QUESTIONS
Name the characteristic of sound in relation to its waveform.
Define amplitude term in relation to a wave.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What is a bulb horn ? Name the principle on which a bulb horn works.
State two factors on which the natural frequency of a body depends.
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
Explain reflection at the boundary of a rarer medium.
