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NEET Sample Paper NEET Sample Test Paper-13

  • question_answer
    The value of Planck's constant is \[6.63\times {{10}^{-34}}\,Js.\] The velocity of light is \[3.0\times {{10}^{8}}m{{s}^{-1}}.\] Which value is closest to the wavelength in nanometer of a quantum of light with frequency of\[8\times {{10}^{15}}{{s}^{-1}}?\]

    A) \[2\times {{10}^{-25}}nm\,\]                

    B) \[5\times {{10}^{-18}}\,nm\]

    C)  4 nm                           

    D) \[3\times {{10}^{-7}}\,nm\]

    Correct Answer: C

    Solution :

     Frequency \[=\frac{C}{\lambda }=\frac{3\times {{10}^{8}}m{{s}^{-1}}}{8\times {{10}^{15}}{{s}^{-1}}}\] \[=0.375\times {{10}^{-7}}m=3.75\,nm\,\approx 4nm\]


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