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

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Question number: 1

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2013

MCQ▾

Question

Two species of radioactive atoms are mixed in equal number. The disintegration of the first species is λ and of the second isEquation . After a long time the mixture will behave as a species with mean life of approximately,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 2

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2014

MCQ▾

Question

The half – life of a particle of mass 1.6 × 10–26 kg is 6.9 s and a stream of such particles is travelling with the kinetic energy of a particle being 0.05 eV. The fraction of particles which will decay when they travel a distance of 1 m is –

Choices

Choice (4) Response

a.

0.1

b.

0.01

c.

0.001

d.

0.0001

Question number: 3

» Atoms and Nuclei » Half Life and Mean Life

MCQ▾

Question

A nucleus has a half – life of 45 minutes. At 2: 45 PM its decay rate was measured as 160, 000 counts/sec. What will be the decay rate at 5: 45 PM?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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