InterviewSolution
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InterviewSolution
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Estimation of frequency of a wave forming a standing wave represented by `y = A sin kx cos t` can be done if the speed and wavelength are known using `speed = "Frequency" xx "wavelength"` . Speed of motion depends on the medium properties namely tension in string and mass per unit length of string . A string may vibrate with different frequencies . The corresponding wavelength should be related to the length of the string by a whole number for a string fixed at both ends . Answer the following questions: If `y = 10 sin 5 x cos 2 t m` represents a stationary wave then , the possible one of the travelling waves causing this isA. `y = 10 sin ( 5x - 2 t)`B. `y = 5 sin ( 2 t - 5x)`C. `y = 10 sin 2t`D. `y = 5 cos 5x` |
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Answer» Correct Answer - B A stationary wave is shown as `y = 2 A sin kx cos omega t` in general . So the amplitude of the original wave is `A`. |
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