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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Self Evaluation Test - Structure of Atom

  • question_answer
    The threshold frequency of a metal is \[1\times {{10}^{15}}{{s}^{-1}}.\] The ratio of the maximum kinetic energies of the photoelectrons when the metal is irradiated with radiations of frequencies \[1.5\times {{10}^{15}}{{s}^{-1}}\] and \[2.0\times {{10}^{15}}{{s}^{-1}}\] respectively would be

    A) 4 : 3 

    B) 1 : 2 

    C) 2 : 1 

    D) 3 : 4

    Correct Answer: B

    Solution :

    [b] \[\frac{{{(KE)}_{1}}}{{{(KE)}_{2}}}=\frac{{{v}_{1}}-{{v}_{0}}}{{{v}_{2}}-{{v}_{0}}}\] \[=\frac{(1.5\times {{10}^{15}}-1\times {{10}^{15}})}{\left( 2.0\times {{10}^{15}}-1\times {{10}^{15}} \right)~}=\frac{1}{2}\]


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