Electrons used in an electron microscope are accelerated by a voltage of 25 kV

Electrons Used In An Electron Microscope Are Accelerated By A Physics QuestionElectrons Used In An Electron Microscope Are Accelerated By A Physics Question

Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased associated to 100 kV then the de-Broglie wavelength associated with the electrons would

Options

(a) increase by 2 times
(b) decrease by 2 times
(c) decrease by 4 times
(d) increase by 4 times

Correct Answer:

decrease by 2 times

Explanation:

λ ∞ 1/√V
λ₁ / λ₂ = √ V₂ / V₁ = √ 1000keV / 25 keV = 2
λ₂ = λ₁ / 2

AddThis Website Tools
AIPMT2011
admin:

Related Questions

  1. If the velocity of an electron increases, then its de Broglie wavelength will
  2. The radius of germanium nuclide is measured to be twice the radius of ₄⁹Be.
  3. A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
  4. When photons of energy hν are incident on the surface of photosensitive
  5. An air bubble in a glass slab with refractive index 1.5 (near normal incidence)