Module 5 : MODERN PHYSICS
Lecture 26 : Wave Nature of Particle - the de Broglie Hypothesis
  Using numerical values of $ h,m$ and $ e$, we get a relationship of the form
 
$\displaystyle \lambda = \sqrt{\frac{1.5}{V}}\ \ {\rm nm}$
 
The wavelength of the electrons in Davisson - Germer experiment can be calculated from the above to be 0.167 nm.
Exercise 4
 

Exercise 5

  Bragg condition is satisfied when the path difference between beams scattered from two adjacent planes is a multiple of the wavelength. The path difference is $ 2d\sin\theta$. For constructive interference of order $ n$ we have
 
$\displaystyle \boxed{2d\sin\theta = n\lambda}$
   
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