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J & K CET Engineering J and K - CET Engineering Solved Paper-2014

  • question_answer
    A galaxy is moving away from an observe on the earth so that sodium light of wavelength \[5892\overset{\text{o}}{\mathop{\text{A}}}\,\] is observed at \[5896\overset{\text{o}}{\mathop{\text{A}}}\,\]. The speed of galaxy is                                       

    A)  \[306\,\,km/s\]         

    B)  \[204\text{ }km/s\]                 

    C)  \[185\,km/s\]         

    D)  \[158\text{ }km/s\]                 

    Correct Answer: B

    Solution :

    \[v=C\frac{\Delta \lambda }{\lambda }\] \[=3\times {{10}^{8}}\times \frac{(5896-5892)}{5892}\] \[=0.00204\times {{10}^{8}}=204\,km/s\]


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