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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited and the colliding electron loses all its kinetic energy consequently, the hydrogen atom may emit a photon corresponding to the largest wavelength of the Balmer series. The minimum kinetic energy of colliding electron is:

    A)  \[10.2\,eV\]                

    B)  \[1.9\,eV\]

    C)  \[12.09\,eV\]              

    D)  \[12.6\,eV\]

    Correct Answer: C

    Solution :

    For emission of photon corresponding to the target wavelength the transition of electron will be from \[n=3\] to \[n=2\]. Hence, after collision of electron with the hydrogen atom, the hydrogen atom will have excited to the state whose quantum number n is at least equal to 3 Minimum energy of colliding electron,             \[\varepsilon =13.6\left( \frac{1}{{{1}^{2}}}=\frac{1}{{{3}^{2}}} \right)\] \[\Rightarrow \]               \[\varepsilon =12.09eV\]


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