Physics-
General
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Question

An electron is moving through a field. It is moving (i) opposite an electric field (ii) perpendicular to a magnetic field as shown. For each situation the de-Broglie wave length of electron

  1. Increasing, increasing    
  2. Increasing, decreasing    
  3. Decreasing, same    
  4. Same, Same    

The correct answer is: Decreasing, same


    lambda equals fraction numerator h over denominator m v end fraction. Since v is increasing in case (i), but it is not changing in case (ii). Hence, in the first case de-Broglie wavelength will change, but it second case, it remain the same

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