Question

What is echo? Explain Echo based on reflection.​

Answer 1

Answer:

Echo:- Repeation of a sound for many times due to reflection is known as an echo.

Explanation:

If d is the distance between the source and the reflector then equation will be as

2d = vt

or

d = vt/2

where;

v = speed of the sound

t = time taken of the echo

Explaination:-

Minimum Distance required for echo:-

As generally effect of any sound exist for 1/10 second in our ears so if the sound comes back before 1/10 second then there will be not be any prominent or distinguished original sound which means echo is not formed.

Therefore we can find the minimum distance as

$\sf{d_{minimum} = \frac{v \times t}{2} } \\ \\ \sf{d_{minimum} = \frac{330}{2}x \frac{1}{10} } \\ \\ \sf{d_{minimum} = \frac{330}{20} } \\ \\ \sf{d_{minimum} = \frac{ \cancel33}{ \cancel2} } \\ \\ \boxed{\sf{d_{minimum} = 16.5m}}$

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Answer 2

Answer:

What is echo?

Echo is defined as a sound repeating by sound wave reflection, having a lasting or far reaching impact, or repeating what someone else has said. An example of echo is the repeating of a sound created by footsteps in an empty marble hallway.

Explanation:

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