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

  • question_answer
    A star emits light of\[5500\,\,{AA}\]wavelength. Its appears blue to an observer on the earth, it means               [DPMT 2002]

    A) Star is going away from the earth

    B) Star is stationary

    C) Star is coming towards earth

    D) None of the above

    Correct Answer: C

    Solution :

    Blue radiations have the wavelength around 4600\[\overset{o}{\mathop{A}}\,\]. It shows that apparent wavelength is smaller than the real wavelength. It means that the star is proceeding towards earth.


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