Atoms and Nuclei (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 3 of 14

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Question number: 1

» Atoms and Nuclei » Radioactivity

Appeared in Year: 2010

MCQ▾

Question

A nucleus has a half-life of 30 minutes. At 3 PM its decay rate was measured as Equation . What will be the decay rate at 5 PM?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 2

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2012

MCQ▾

Question

A parent nucleus X is decaying into daughter nucleus Y which in turn decays to Z. The half-lives of X and Y are 4000 years and 20 years respectively. In a certain sample, it is found that the number of Y nuclei hardly changes with time. If the number of X nuclei in the sample is 4 × 1020, the number of Y nuclei present in it is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 3

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2012

MCQ▾

Question

A radioactive nucleus A has a single decay mode with half-life τA. Another radioactive nucleus B has two decay modes 1 and 2. If decay mode 2 were absent, the half-life of B would have beenEquation . If decay mode 1 were absent, the half – life of B would have beenEquation . If the actual half – life of B is Equation , then the ratio Equation is –

Choices

Choice (4) Response

a.

Equation

b.

1

c.

Equation

d.

Equation

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