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VMMC VMMC Medical Solved Paper-2010

  • question_answer
    A radio transmitter radiates 1 kW power at a wavelength 198.6 m. How many photons does it emit per second?

    A)  \[{{10}^{10}}\] 

    B)  \[{{10}^{20}}\]                                                                    

    C)  \[{{10}^{30}}\]                 

    D)         \[{{10}^{40}}\]

    Correct Answer: C

    Solution :

    Number of photons \[n=\frac{P}{E}=\frac{P}{hv}=\frac{P\lambda }{hc}\] \[=\frac{1000\times 198.6}{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}\approx {{10}^{30}}\]


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