A sound is produced between two vertical parallel walls. The echo from one wall is heard after 2 s while from the other 2 s after the first echo. The speed of sound in air is 
. Choose the correct option.
Text Solution
Verified by ExpertsThe correct answer is:
B
According to question,
Distance between walls 
Next echo will be heard at 6 s not at 8 s , because sound wave reflected from 
will be reflected by 
in next 2 s .
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