Physics, asked by Anonymous, 1 year ago

a sound wave has frequency 2hz and wave length 40cm. how long will it take to travel 1.6km

Answers

Answered by ydharmendra888

Given that. n=2hz,lembda=40cm
So v=n*lambda =2*40=80 cm/s
Now time =distance /velocity =1.6km/80
=160000cm/80=2000 sec=33.3min

Anonymous: didi i also got 2000sec but in my exam i did not have converted into minute... will the marks be cut?

ydharmendra888: no it is right

ydharmendra888: mark will not cut

Anonymous: what is negative work

Anonymous: work done against gravity is known as negative work????

ydharmendra888: no all works we against gravity

ydharmendra888: but instance the direction of force of gravity on freely falling body towards the centre of Earth

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