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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
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Hydrogen gas in the atomic state is excited to an energy level such that the electrostatic potential energy of hydrogen atom becomes -1.7 eV. Now a photoelectric plate having work function 2.3 eV is exposed to the emission spectra of this gas. Assuming all the transitions to be possible, find the minimum de-Broglie wavelength of the ejected photoelectrons in to the nearest integer.
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Correct option: A
4
Option A (4) is correct because the maximum energy of the emitted photon corresponds to the transition from n=2 to n=1, and this energy, minus the work function, gives the maximum kinetic energy of the photoelectron, from which the de Broglie wavelength can be calculated.
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