The sound of an explosion on a surface of the lake is heard by a men 150 m away and by a driver 150 m below the point of explosion. answer the following.
a) Explain who will hear the sound of explosion first.
b) If sound takes t sec to reach the man, how much time will it take to reach the driver ? ( Speed of sound in air is 344m/sec and in water is 1533m/sec)
c) Give the audible range of the man . Give one example each of organisms which use waves of (i) lower than (ii) higher than this range.

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Solution

Dear Student

(a) Driver will hear sound of explosion forst as speed of sound in water is more than air.

(b)

$s p e e d = \frac{D i s \tan c e}{t i m e} T i m e = \frac{D i s \tan c e}{s p e e d} T i m e t a k e n b y s o u n d t o r e a c h t h e m a n = \frac{D i s \tan c e}{s p e e d o f s o u n d i n a i r} = \frac{150}{344} = 0.4360 s T i m e t a k e n b y s o u n d t o r e a c h t h e d r i v e r = \frac{D i s \tan c e}{s p e e d o f s o u n d i n w a t e r} = \frac{150}{1533} = 0.0978 s$

C--The audible range of man is 20 to 20000hz
(1) elephant
(2)bats

Regards

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