Wave motionHard
Question
Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be
Options
A.zero
B.purely kinetic
C.purely potential
D.partly kinetic and partly potential
Solution
Sol. 
[Energy will be in purely kinetic form]
PE is zero because there is no expansion in string at the moment.
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