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Question

Calculate the wavelength associated with an electron moving with a velocity of 109 cm/s.
  1. 0.73 A
  2. 0.82 A
  3. 0.67 A
  4. 1.01 A


Solution

The correct option is A 0.73 A
Given,
Velocity of electron (v)=109 cm/s

We know that,
Planck's constant (h)=6.63×1027 ergs
Mass of electron (me)=9.1×1028 g

Again,
de Broglie wavelength (λ)=hmv
                                            =6.63×10279.1×1028×109                                            =7.28×109 cm
                                            =0.73 A

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