CBSE Class 12 Physics 2015 Delhi Set 1 Paper

Question : 6

Total: 26

SECTION - B

A proton and an α-particle have the same deBroglie wavelength. Determine the ratio of (i) their accelerating potentials (ii) their speeds.

Solution:

Ans. Determination of ratio (i) accelerating potential
(ii) speed
(i) λ‌=‌

√2mqV

V‌=‌

2mqλ2

mα‌=4mpqα=2qp
⇒‌‌‌

Vα

‌=‌

mαqα

mpqp

‌=‌

4mp×2qp

mpqp

‌=8:1
(ii) λ‌=‌

⇒v‌=‌

mλ

⇒‌

vα

‌=‌

mα

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