Atoms and Nuclei-Radioactivity (KVPY Stream-SA (Class 11) Physics): Questions 1 - 5 of 5

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Question number: 1

» Atoms and Nuclei » Radioactivity

Appeared in Year: 2015

MCQ▾

Question

The beta particles of a radioactive metal originate from

Choices

Choice (4) Response
a.

The free electrons in the metal

b.

The orbiting electrons of the metal atoms

c.

The photons released from the nucleus

d.

The nucleus of the metal atoms

Question number: 2

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The activity of a radioactive sample reduces to 15 of its original value in 9 hours. What will be its activity in 27 hours?

Choices

Choice (4) Response
a.

1125

b.

17

c.

1124

d.

121

Question number: 3

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

92U238 atom disintegrates to 89Ac226 with a half-life of 4.7 ⨯ 109 years by emitting three alpha and n beta particles. Here n is –

Choices

Choice (4) Response
a.

2

b.

3

c.

4

d.

5

Question number: 4

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The activity of a radioactive sample reduces to 13 of its original value in 2 hours. What will be its activity in 6 hours?

Choices

Choice (4) Response
a.

13

b.

127

c.

181

d.

19

Question number: 5

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The activity of a radioactive sample reduces to 17 of its original value in 4 hours. What will be its activity in 8 hours?

Choices

Choice (4) Response
a.

17

b.

114

c.

121

d.

149

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