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

  • question_answer
    A star is moving away from the earth with a velocity of 100 km/s. If the velocity of light is \[3\times {{10}^{8}}m/s\] then the shift of its spectral line of wavelength\[5700\,\,{AA}\]due to Doppler's effect will be                                     [MP PMT 1994]

    A) \[0.63\,\,{AA}\]                

    B) \[1.90\,\,{AA}\]

    C) \[3.80\,\,{AA}\]

    D) \[5.70\,\,{AA}\]

    Correct Answer: B

    Solution :

    \[\Delta \lambda =\lambda \frac{v}{c}=5700\times \frac{100\times {{10}^{3}}}{3\times {{10}^{8}}}=1.90{AA}\]


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