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Q.

Is it true that echo can be heard in every type of room?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
We hear double sounds if we clap in front of a hill or mountain. We produce one sound, and another is the reflection of the sound from the hard surface. Our ears are susceptible to distinguish the sound repeated after at least 0.1 second. Distance travelled by the sound in 0.1 second is 340×0.1= 34 m. So the room walls should be at least 34/2 = 17 m apart to hear the echo. Not every type of room is 17 m wide.
The correct statement would be that echo can not be heard is every type of room.
 
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