A travelling wave on a string carries an average power of 12 W and has frequency 4 Hz. If the energy transported through a fixed point during one complete time period is N joules, find N.
Physics · Wave Motion · Transverse Waves on a Stretched String and Wave Speed
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Question

A travelling wave on a string carries an average power of 12 W and has frequency 4 Hz. If the energy transported through a fixed point during one complete time period is N joules, find N.

G1 Physics · Accepted Answer

The time period is T = 1/f = 1/4 s. Energy transported in one period is E = P̄T. Therefore, E = 12×1/4 = 3 J. Hence, N = 3.