First slide

Stationary waves

Question

Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be

Moderate

A

Zero
B

Purely kinetic
C

Purely potential
D

Partly kinetic and partly potential

Solution

After 2 sec the pulses will overlap completely. The string becomes straight and therefore does not have any potential energy and its entire energy must be kinetic.

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