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

  • question_answer
    A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz\[.\] The speed of sound in a tissue is 1.7 km-s?1. The wavelength of sound in the tissue is close to [CBSE PMT 1995]

    A)            \[4\times {{10}^{-4}}\,m\]     

    B)            \[8\times {{10}^{-3}}\,m\]

    C)            \[4\times {{10}^{-3}}\,m\]     

    D)            \[8\times {{10}^{-4}}\,m\]

    Correct Answer: A

    Solution :

               \[\lambda =\frac{v}{n}=\frac{1.7\times 1000}{4.2\times {{10}^{6}}}=4\times {{10}^{-4}}\]\[m\]


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