Question: Q. 7. A proton and an α-particle have the same de Broglie wavelength. Determine the ratio of (i) their accelerating potentials and (ii) their speeds.

U [Delhi I, II, III 2014]

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Solution:

Ans. (i)

λ=h2mqVV=h22mqλ21/2 mα=4mpqα=2qp VpVα=mαqαmpqp=4mp×2qpmpqp =8:1

VpVα=mαqαmpqp=4mp×2qpmpqp1/2

(ii)

λ=hmvv=hmλ1/2

vpvα=mαmp=4

[CBSE Marking Scheme 2014]



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