Atoms and Nuclei (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 4 - 6 of 14

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Question number: 4

» 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 is λ3 . After a long time the mixture will behave as a species with mean life of approximately,

Choices

Choice (4) Response
a.

1.00λ

b.

0.52λ

c.

0.70λ

d.

2.10λ

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

XZAYz+1A+β+Ve

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

Choices

Choice (4) Response
a.

M(A,Z)>M(A,Z+1)+me

b.

M(A,Z)>M(A,Z+1)

c.

M(A,Z)>M(A,Z+1)+Zme

d.

M(A,Z)>M(A,Z+1)me

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.

0.5MeV

b.

2.5MeV

c.

7.5MeV

d.

8.0MeV

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