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.
 

Dear Student

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

(b)


speed=Distance timeTime=Distance speedTime taken by sound to reach the man =Distance speed of sound in air=150344=0.4360 sTime taken by sound to reach the driver =Distance speed of sound in water=1501533=0.0978 s

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

Regards

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