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NEET 2011
Exam
NEET
Year
2011
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2011 · Physics · Dual Nature of Matter

An electron in the hydrogen atom jumps from excited state n to the...

An electron in the hydrogen atom jumps from excited state nn to the ground state. The wavelength so emitted illuminates a photo-sensitive material having work function 2.75eV2.75 \mathrm{eV}. If the stopping potential of the photo-electron is 10 V10 \mathrm{~V}, the value of nn isAn electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminatesAn electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates

Options

  1. A3
  2. B4
  3. C5
  4. D2

Correct answer

A. 3

Step-by-step solution

E=KEmax⁡+W=eV0+W=10+2.75E=12.75eV\begin{aligned}E & =\mathrm{KE}_{\max }+W \\ & =e V_0+W \\ & =10+2.75 \\ E & =12.75 \mathrm{eV} \end{aligned}An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminatesDifferenceof4and1energylevelis\\ Difference of 4 and 1 energy level is12.75 \mathrm{eV}.So,higherenergylevelis4togroundandexcitedstateis. So, higher energy level is 4 to ground and excited state isn=3$.
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