Atoms and Nuclei (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 5 - 8 of 14

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Question number: 5

» Atoms and Nuclei » Mass-Energy Relation

Appeared in Year: 2013

MCQ▾

Question

A nuclear decay is possible if the mass of the parent nucleus exceeds the total mass of the decay particles. If M (A, Z) denotes the mass of a single neutral atom of an element with mass number A and atomic number Z, then the minimal condition that the β decay

will occur is (me denotes the mass of the β particle and the neutrino mass mv can be neglected):

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 6

» Atoms and Nuclei » Binding Energy Per Nucleon

Appeared in Year: 2014

MCQ▾

Question

The binding energy per nucleon of 5B10 is 8.0 MeV and that of 5B11 is 7.5 MeV. The energy required to remove a neutron from 5B11 is (mass of electron and proton are 9.11 × 1031 kg and 1.67 × 1027 kg, respectively) –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 7

» 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: 8

» Atoms and Nuclei » Radioactive Decay Law

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 6000 years and 30 years respectively. In a certain sample, it is found that the number of Y nuclei hardly change with time. If the number of X nuclei in the sample is the number of Y nuclei present in it is –

Choices

Choice (4) Response

a.

b.

c.

d.

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