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

  • question_answer
    A star producing light of wavelength\[6000\,\,{AA}\]moves away from the earth with a  speed of 5 km/sec. Due to Doppler effect the shift in wavelength will be \[(c=3\times {{10}^{8}}m/\sec )\] [MP PMT 1990]

    A) \[0.1\,\,{AA}\]                   

    B) \[0.05\,\,{AA}\]

    C) \[0.2\,\,{AA}\]                   

    D) \[1\,\,{AA}\]

    Correct Answer: A

    Solution :

    Doppler's shift is given by            \[\Delta \lambda =\frac{v\lambda }{c}=\frac{5000\times 6000}{3\times {{10}^{8}}}=0.1{AA}\]


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