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JEE Main & Advanced Physics Wave Mechanics Question Bank Basics of Mechanical Waves

  • question_answer
    An underwater sonar source operating at a frequency of 60 KHz directs its beam towards the surface. If the velocity of sound in air is 330 m/s, the wavelength and frequency of waves in air are:                                      [DPMT 2004]

    A)            5.5 mm, 60 KHz                   

    B)            330 m, 60 KHz

    C)            5.5 mm, 20 KHz                   

    D)            5.5 mm, 80 KHz

    Correct Answer: A

    Solution :

                Frequency of waves remains same, i.e. 60 Hz                    and wavelength \[\lambda =\frac{v}{n}=\frac{330}{60\times {{10}^{3}}}\]= 5.5 mm.


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