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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Doppler's Effect of Light

  • question_answer
     A star emitting radiation at a wavelength of \[5000\,{AA}\] is approaching earth with a velocity of\[1.5\times {{10}^{6}}m/s\]. The change in wavelength of the radiation as received on the earth, is                                            [CBSE PMT 1995]

    A) \[25\,\,{AA}\]

    B) Zero

    C) \[100\,\,{AA}\]                  

    D) \[2.5\,\,{AA}\]           

    Correct Answer: A

    Solution :

    \[\Delta \lambda =\lambda .\ \frac{v}{c}=\frac{1.5\times {{10}^{6}}}{3\times {{10}^{8}}}\times 5000=25{AA}\]


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