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CBSE Class 12 Physics 2016 Delhi Set 1 Paper

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Question : 7
Total: 26
Plot a graph showing variation of de-Broglie wavelength λ versus ‌1∕√V , 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 ?
Solution:  
Plotting of graph
Identification of line representing lower mass
Reason
As λ=‌
h
√2meV
As the charge of two particles is same, therefore
‌
λ
(‌
1
√V
)
α‌
1
√m
 i.e. slope α‌
1
√m
Hence, particle with lower mass (m2) will have greater slope.
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