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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2005

  • question_answer
    The velocity of all radio waves in free space is \[3\times {{10}^{5}}\,m/s\]. The frequency of a radio wave of wavelength 150 m is:

    A)  20 kHz                                 

    B)  2 kHz

    C)  2 MHz                 

    D)         1 MHz

    Correct Answer: C

    Solution :

    Here : Velocity of electromagnetic waves in free space and wavelength \[\upsilon =3\times {{10}^{8}}\,m/s\]     \[\lambda =150\,m\] Using the relation for the frequency of radio waves is given by                                                 \[=\frac{\upsilon }{\lambda }=\frac{3\times {{10}^{8}}}{150}\]                    \[=2\times {{10}^{6}}\,Hz=2\,MHz\]


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