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NEET Sample Paper NEET Sample Test Paper-49

  • question_answer
    The period of rotation of the sun at its equator is T and its radius is R. Then the Doppler wavelength shift expected for light with wavelength \[\lambda \], emitted from the edge of the sun?s disc is- [\[c\,\,=\,\,speed\text{ }of\text{ }light\]]

    A) \[\pm \,\frac{R\lambda }{cT}\]               

    B) \[\pm \,\frac{T\lambda }{2\pi Rc}\]

    C) \[\pm \,\frac{2\pi Rc}{T\lambda }\]                     

    D) \[\pm \,\frac{2\pi R\lambda }{cT}\]

    Correct Answer: D

    Solution :

    \[\Delta \lambda \,\,=\,\,\pm \,\frac{v}{c}\,\,\lambda \] \[v=R\omega =\frac{R2\pi }{T}\] \[\Delta \lambda \,\,=\,\,\pm \,\frac{2\pi R\lambda }{cT}\]


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