(a) A boy claps his hand in front of a cliff and hears the echo 2 sec later . If the speed of sound is 340m/sec , calculate the distance of the cliff from the boy.
(b) state the law of magnestism
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(a)340 m
(b)Unlike poles attract, like poles repel ( can be verified with experiment of a magnet suspended by a height )
Explanation:
Numerical (a) given in picture
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Solution :
Given
Speed of sound, v=340ms−1
Time taken for hearing the echo,
t = 2 s
Distance travelled by the sound
=v×t=340ms−1×2s=680m
In 2 s sound has to travel twice the distance between the cliff and the person. Hence, the distance between the cliff and the person
= 680 m/2 = 340 m.
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