NEET Sample Paper NEET Sample Test Paper-15

  • question_answer The light waves from two independent monochromatic light sources are given by:  \[{{y}_{1}}=2\,\sin \omega t\]and \[{{y}_{2}}=3\,\cos \omega t.\]Then the correct statement is:

    A)  Both the waves are coherent

    B)  Both the waves are incoherent

    C)  Both the waves have different time periods

    D)  None of the above

    Correct Answer: A

    Solution :

    \[{{y}_{2}}=3\cos \omega t=3\sin \left( \frac{\pi }{2}+\omega t \right)\] So, the phase difference between them is \[\frac{\pi }{2},\]which remains constant with time, so they behave as coherent sources.                              Hence, the correction option is [a].

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