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Question
How can you calculate the speed of sound using echo?
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Solution
Apparatus required:
A source of sound pulses, a measuring tape, a sound receiver, and a stopwatch.
Calculation of speed of sound:
The sound pulse emitted by the source travels a total distance of 2nd while travelling from the source to the wall and then back to the receiver.
The time taken for this has been observed to be ‘t’. Hence, the speed of the sound wave is given by:
Speed of sound = `"Distance travelled"/"Time taken"` = `(2"d")/"t"`
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RELATED QUESTIONS
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
Name any two objects which are good reflectors of sound.
State the laws of reflection of sound.
What is an echo ? How is echo formed ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
What is an echo?
State two conditions necessary for hearing an echo.
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
