Q.

Two pulses are traveling along a string in opposite directions towards each other as shown in the figure. If the wave velocity is 2 cm/s and the pulses are 6 cm apart, then after 1.5 sec, the energy stored in the string will be (Assume shapes of pulses to be similar)

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a

kinetic energy only

b

potential energy only

c

kinetic energy as well as potential energy

d

none of these

answer is A.

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Detailed Solution

The string will be straight at this instant. All the particles of medium will be passing through their mean positions. There will be no stretching in the string.
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Two pulses are traveling along a string in opposite directions towards each other as shown in the figure. If the wave velocity is 2 cm/s and the pulses are 6 cm apart, then after 1.5 sec, the energy stored in the string will be (Assume shapes of pulses to be similar)