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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Wave Nature and Interference of Light

  • question_answer
    The frequency of light ray having the wavelength 3000 Å is  [DPMT 2002]

    A)            9 ´ 1013 cycles/sec              

    B)            1015 cycles/sec 

    C)            90 cycles/sec                        

    D)            3000 cycles/sec

    Correct Answer: B

    Solution :

               \[\nu =\frac{c}{\lambda }=\frac{3\times {{10}^{8}}}{3000\times {{10}^{-10}}}={{10}^{15}}\]cycles/sec


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