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Atomic Physics Theory MCQ Question with Answer

Atomic Physics Theory MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 22
The distance of closest approach of an α-particle fired towards a nucleus with momentum p, is r. What will be the distance of closest approach when the momentum of a-particle is 2p ?

2r
4r
r/2
r/4
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Question No : 23
Which of the following is incorrect regarding Rutherford's atomic model ?

Atom contains nucleus
Size of nucleus is very small in comparison to that of atom
Nucleus contains about 90% mass of the atom
Electrons revolve round the nucleus with uniform speed
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Question No : 24
In Rutherford experiment the number of a-particles scattered through an angle 60° is 112 per minute, then the number of α particles scattered through an angle of 90° per minute by the same nucleus is :

28 per min
112 per min
12.5 per min
7 per min
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