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JEE Main & Advanced Physics Wave Mechanics Question Bank Progressive Waves

  • question_answer
    Two waves of frequencies 20 Hz and 30 Hz. Travels out from a common point. The phase difference between them after 0.6 sec is                                                               [JIPMER 1999]

    A)            Zero                                         

    B)            \[\frac{\pi }{2}\]

    C)            \[\pi \]                                    

    D)            \[\frac{3\pi }{4}\]

    Correct Answer: A

    Solution :

               Beats period = \[\frac{1}{30-20}=0.1\] sec                    \[\Delta \varphi =\frac{2\pi }{T}\Delta .t=\frac{2\pi }{0.1}\times 0.6=2\pi \times 6=12\]\[\pi \] or Zero.


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