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

  • question_answer
    The wavelength of ultrasonic waves in air is of the order of [EAMCET 1989]

    A)            \[5\times {{10}^{-5}}\,cm\]   

    B)            \[5\times {{10}^{-8}}\,cm\]

    C)            \[5\times {{10}^{5}}\,cm\]     

    D)            \[5\times {{10}^{8}}\,cm\]

    Correct Answer: A

    Solution :

               \[\lambda =\frac{v}{n}\,;\,n\approx 50,000\,Hz\], \[v=330\]m/sec Þ\[\lambda =\frac{330}{50000}m\]                    \[=6.6\times {{10}^{-5}}cm\approx 5\times {{10}^{-5}}cm\]


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