Question

State three conditions for the formation of an echo.

Answer 1

Answer:

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The three conditions for the formation of an echo are as follows:-

a)There should be sufficient time gap between Orginal sound & reflected sounds. So, to hear distinct echo the reflected sound should reach the ear after 0.1s after the original sound.

b)The distance between the source of the sound & the obstacle should be sufficient.An echo will heard distinctly if the minimum distance between the source of sound & obstacle is 34.4/2=17.2 m

c)The reflecting surface must be rigid such as building,hill or a cliff

d)Size of the obstacle should be quite large for the echoes to be heard.

You can consider Any 3 points.

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