Question

1) What is Echo ?
2) Which property of sound is responsible for the formation of echo ?
3) Choose the correct answer:
The reflector of sound should be
(a) hard
(b) smooth or rough
(c) soft
(d) a and b are correct
(e) c and b are carrect
4) Calculate the minimum distance between the listener and the reflector/obstacle of sound, necessary for hearing an echo distinctly when the temperature of the day is 22° Celsius ?
5) Find the depth of the sea when it is found that an ultrasound wave of speed 1500m/s takes 3·5 seconds to move from the transmeter to the receiver of a ship after striking the seabed.(Draw a diagram befitting the question.)
6) Explain how bats detect obstacles on their way.​

Answer 1

Answer:

A sound or sounds caused by the reflection of sound waves from a surface back to the listener.

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