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NEET 2020
Exam
NEET
Year
2020
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2020 · Physics · Dual Nature of Matter

The de-Broglie wavelength of an electron moving with kinetic energy...

The de-Broglie wavelength of an electron moving with kinetic energy of 144eV144eV is nearly

Options

  1. A102×10−3nm102 \times {10}^{- 3}nm
  2. B102×10−4nm102 \times {10}^{- 4}nm
  3. C102×10−5nm102 \times {10}^{- 5}nm
  4. D102×10−2nm102 \times {10}^{- 2}nm

Correct answer

A. 102×10−3nm102 \times {10}^{- 3}nm

Step-by-step solution

The formula of de-Broglie wavelength,& λ=h2mK.E.\lambda = \dfrac{h}{2mK . E .}~and we know that,& K.E.=eVK . E . = eV. Recall the proper relation between wavelength~and electric potential, in angstrom, λ=12.27VA˚=12.27144×10−10=1.02×10−10m\lambda = \dfrac{12 . 27}{V}Å= \dfrac{12 . 27}{144} \times {10}^{- 10}= 1 . 02 \times {10}^{- 10}m

it means the wavelength,~λ=102×10−3nm\lambda = 102 \times {10}^{- 3}nm.&

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