CBSE Class 12 Physics 2016 Outside Delhi Set 1 Paper

Question : 8

Total: 26

Calculate the de-Broglie wavelength of the electron orbiting in the n=2 state of hydrogen atom.

Solution:

Formulae of kinetic energy and de-Broglie a wavelength
Calculation and Result
Kinetic Energy for the second state-
Ek=‌

13.6eV

=‌

13.6‌eV

=3.4×1.6×10−19J
‌‌ de-Broglies wavelength ‌λ=‌

√2mEk

‌=‌

6.63×10−34

√2×9.1×10−31×3.4×1.6×10−19

‌=0.067‌nm

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