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Q.

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 in 2 cm/s. After 2 s the total energy of the pulses will be.

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a

Purely potential

b

Purely kinetic

c

Zero

d

Partly kinetic and partly potential

answer is B.

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Detailed Solution

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After two seconds both the pulses will move 4 cm towards each other. So, by their superposition, the resultant displacement at every point will be zero. Therefore, total energy will be purely in the form of kinetic. Half of the particles will be moving upwords and half downwards

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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 in 2 cm/s. After 2 s the total energy of the pulses will be.