JEE Main & Advanced Chemistry Structure of Atom Question Bank Critical Thinking

  • question_answer The ratio of the energy of a photon of \[2000{AA}\] wavelength radiation to that of \[4000{AA}\] radiation is [IIT 1986; DCE 2000; JIPMER 2000]

    A) 1/4        

    B) 4

    C) 1/2

    D) 2

    Correct Answer: D

    Solution :

    \[E=hv=h\frac{c}{\lambda }\,\] i.e. \[E\propto \frac{1}{\lambda }\]                 \[\frac{{{E}_{1}}}{{{E}_{2}}}=\frac{{{\lambda }_{2}}}{{{\lambda }_{1}}}=\frac{4000}{2000}=2.\]

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