Atoms and Nuclei (NEST (National Entrance Screening Test) Physics): Questions 1 - 2 of 2

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Question number: 1

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2008

MCQ▾

Question

A sample of radioactive nuclei of a certain element can decay by both emission and emission. The half – life for emission is minutes and that for emission is minutes. The half – life for the sample is nearly –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2009

MCQ▾

Question

A radioactive source, having a half – life of five minutes, was found to have a counting rate of at a certain point in time. Fifteen minutes after this observation, the counting rate is –

Choices

Choice (4) Response

a.

b.

c.

d.

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