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NEET Sample Paper NEET Sample Test Paper-54

  • question_answer
    The rest mass of an electron as well as that of positron is 0.51 MeV. When an electron and positron are annihilate, they produce 2 gamma- photons of wavelength(s)-

    A) \[0.012\text{ }\overset{{}^\circ }{\mathop{A}}\,\]                      

    B) \[0.024\text{ }\overset{{}^\circ }{\mathop{A}}\,\]

    C) \[0.012\text{ }\overset{{}^\circ }{\mathop{A}}\,~\text{ }to\text{ }\infty \]          

    D) \[0.024\text{ }\overset{{}^\circ }{\mathop{A}}\,~\text{ }to\text{ }\infty \]

    Correct Answer: B

    Solution :

    \[\lambda =\frac{12400\overset{{}^\circ }{\mathop{A}}\,}{0.51\times {{10}^{6}}}=0.024\,\overset{{}^\circ }{\mathop{A}}\,\]


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