NEET Sample Paper NEET Sample Test Paper-39

  • question_answer Calculate the energy in joule corresponding to light of wavelength 45 nm: (Planck's constant \[h=6.63\times {{10}^{-34}}\,Js;\]speed of light\[c=3\times {{10}^{8}}\,m{{s}^{-1}}\])

    A) \[6.67\times {{10}^{15}}\]

    B) \[6.67\times {{10}^{11}}\]

    C) \[4.42\times {{10}^{-15}}\]

    D) \[4.42\times {{10}^{-18}}\]   

    Correct Answer: D

    Solution :

     \[\frac{hc}{\lambda }=\frac{6.63\times {{10}^{-34}}\times 3\times {{10}^{8}}}{45\times {{10}^{-9}}}=4.42\times {{10}^{-18}}J\]

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