Question: Q. 4. Plot a graph showing variation of de-Broglie wavelength versus 1V, where, V is accelerating potential for two particles A and B carrying same charge but of masses m1,m2(m1>m2). Which one of the two represents a particle of smaller mass and why?

U] [Delhi I, II, III 2016]

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Solution:

Ans. As

λ=h2mqV

As the charge of two particles is same, therefore

λ(1V)1m i.e., slope 1m

2

Hence, particle with lower mass (m2) will have greater slope.

[CBSE Marking Scheme 2016]

Commonly Made Error

  • Most of the students couldn’t relate the slope values.
  • Some students even couldn’t draw the graph.


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