0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 27. A student shakes a horizontally-stretched

Question

0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 27. A student shakes a horizontally-stretched cord, creating waves. The graph above shows the vertical position y as a function of time for a point on the cord. The student then tightens the cord so that waves on it will travel faster than before. How should the student now shake the cord to make the graph of y versus t for the point look the same as above? (A) With fewer shakes per second than before (B) With the same number of shakes per second as before (C) With more shakes per second than before (D) The answer cannot be determined without knowing the wavelength of the waves.

Explanation / Answer

Here velocity v increase.

But the graph will be same if frequency is also same and so is amplitude. So number of shakes per second is correct.

option B is correct.

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