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JEE Main & Advanced Physics Wave Mechanics Question Bank Progressive Waves

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    A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and                                                              [MP PMT 1990]

    A)            The wavelength is 5 m

    B)            The frequency is 5 Hz

    C)            The velocity of propagation is 5 m/s

    D)            The wavelength is 0.2 m

    Correct Answer: B

    Solution :

               Phase difference between two successive crest is 2p. Also, phase difference \[(\Delta \varphi )\]= \[\frac{2\pi }{T}\] time interval \[(\Delta t)\]                    Þ \[2\pi =\frac{2\pi }{T}\times 0.2\Rightarrow \frac{1}{T}=5{{\sec }^{-1}}\Rightarrow n=5\,Hz\]


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