| DIRECTION (Qs. 54): Read the following passage and answer the questions that follows: |
| A sinusoidal wave is propagating in negative x-direction in a string stretched along x-axis. A particle of string at \[x=2m\] is found at its mean position and it is moving in positive y-direction at \[t=1\] sec. The amplitude of the wave, the wavelength and the angular frequency of the wave are \[0.1\] meter, \[\pi /2\] meter and \[2\pi \] rad/sec respectively. |
A) \[10\,J/s\]
B) \[~4\pi /3\text{ }\,\,J/s\]
C) \[2\pi /3\text{ }\,\,J/s\]
D) \[0\]
Correct Answer: D
Solution :
Time period of oscillation\[T=\frac{2\pi }{\omega }=\frac{2\pi }{2\pi }=1\sec .\]. second, the particle is at rest at extreme position. Hence instantaneous power at \[x=2\] at t = 1.25 sec is zero.
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