NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    The wavelength of light of frequency 100 Hz is:                                                                  [AIPMT 1999]

    A)  \[2\times {{10}^{6}}m\]         

    B)       3\[3\times {{10}^{6}}m\]

    C)  \[4\times {{10}^{6}}m\]

    D)                   \[5\times {{10}^{6}}m\]

    Correct Answer: B

    Solution :

    The relation between velocity of light  frequency (v) and wavelength \[(\lambda )\] is.
    \[c=v\lambda \]
    Thus, wavelength \[\lambda =\frac{c}{v}\]
    Given, \[c=3\times {{10}^{8}}m/s,\text{ }v=100\text{ }Hz\]
    \[\therefore \]      \[\lambda =\frac{3\times {{10}^{8}}}{100}=3\times {{10}^{6}}\,m\]
    Note:    If light undergoes any medium other than air or vacuum, its frequency does not change.

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