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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2005

  • question_answer
    A light source approaches the observer with velocity 0.8 c. The Doppler shift for the light of wavelength \[5500\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\] is

    A) \[5500\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]

    B) \[1833\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]

    C) \[4400\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]

    D) \[7333\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]

    Correct Answer: C

    Solution :

    Doppler shift \[\Delta \lambda =\frac{v}{c}\lambda \] \[=\frac{0.8c}{c}\times 5500\] \[=4400\overset{\text{o}}{\mathop{\text{A}}}\,\]


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