Sound WavesEasy
Question
Two pulse in a stretched string, whose centers 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 s the total energy of the pulses will b
Options
A.zero
B.purely kinetic
C.purely potential
D.purely kinetic and partly potential
Solution
After two seconds both the pulse will move 4 cm towards each other. So, by their super position, the resultant displacement at every point will be zero. Therefore, total energy will purely in the form of kinetic. Half of the particles will be moving upwards and half downwards.
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