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

  • question_answer
    A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)                                                 [Kerala (Engg.) 2002]

    A)            106 : 1                                      

    B)            104 : 1

    C)            102 : 1                                      

    D)            10 : 1

    Correct Answer: A

    Solution :

               \[n=\frac{v}{\lambda }\propto v\]Þ \[\frac{{{n}_{MW}}}{{{n}_{US}}}\approx \frac{3\times {{10}^{8}}}{3\times {{10}^{2}}}\approx {{10}^{6}}:1\]


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