Explanation
As the source is moving perpendicular to straight line joining the observer and source. (as if moving along a circle).apparent frequency is not affected. n1 = 0
When K.E is maximum, velocity is max, which is the case while passing through the mean position. Therefore, the appearance of the string at that instant is a straight line.
Distance covered by the pulse = speed x time = 4 cm in
2 seconds both will cover 4 cm & the centre of both will
superpose & potential energy will be zero.
∴ Total energy will be in the from of kinetic energy.
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