Question

How far from a sound reflecting surface, a listener should be to hear an echo? ​

Answer 1

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The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source. When a sound produces an echo in two seconds, the reflecting object is 343m away.

Answer 2

Answer:

Answer: By definition , a surd is an irrational root of a rational number.So now we know that surds are always irrational and they are always roots. ... On the other hand, is not a surd even though is irrational, because is not rational