JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Hard

1 of 1

Application +4 | -1

Photons having energy equivalent to binding energy of

4^{\text {th }}

state of

\mathrm{He}^{+}

ion is used on the metal surface of work function

1.4 \mathrm{eV}

. If electrons are further accelerated through
the potential difference of

4 \mathrm{~V}

then the minimum value of de-Broglie wavelength associated with the electron is

View answer and explanation

Correct option: C

5 \mathrm{~A}

Option C (5 A) is correct because the de-Broglie wavelength is calculated using the total kinetic energy of the electron.

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n^{\text {th }}

\mathrm{A}

\times 10^{12}

\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

\ell = 1,\,\,m = 0

1.25 \times {10^{ - 13}} \times {A^{1/3}}\mathrm{cm}.