Which of the following isotopes is normally fissionable ?

(1) U23892             

(2) Np23993

(3) U23592             

(4) He42

Subtopic:  Mass-Energy Equivalent |
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The process by which a heavy nucleus splits into light nuclei is known as 

(1) Fission           

(2) α-decay

(3) Fusion             

(4) Chain reaction

Subtopic:  Mass-Energy Equivalent |
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The explosion of the atomic bomb takes place due to

1. Nuclear fission           

2. Nuclear fusion

3. Scattering               

4. Thermionic emission

Subtopic:  Mass-Energy Equivalent |
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In nuclear reaction \({}_{2}^{4}\mathrm{He}+ {}_{Z}^{A}\mathrm{X}\rightarrow {}_{Z+2}^{A+3}\mathrm{X}+\mathrm{B},\) \(\mathrm {B}\) denotes:
1. Electron
2. Positron
3. Proton
4. Neutron

Subtopic:  Types of Decay |
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Energy generation in stars is mainly due to

(1) Chemical reactions               

(2) Fission of heavy nuclei

(3) Fusion of light nuclei             

(4) Fusion of heavy nuclei

Subtopic:  Mass-Energy Equivalent |
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Fusion reaction is initiated with the help of 

(1) Low temperature         

(2) High temperature

(3) Neutrons                     

(4) Any particle

Subtopic:  Mass-Energy Equivalent |
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When a Be49 atom is bombarded with α particles, one of the product of nuclear transmutation is C612. The other is 

(1) e-10           

(2) H11

(3) D12            

(4) n01

Subtopic:  Mass-Energy Equivalent |
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During the nuclear fusion reaction 

(1) A heavy nucleus breaks into two fragments by itself

(2) A light nucleus bombarded by thermal neutrons breaks up

(3) A heavy nucleus bombarded by thermal neutrons breaks up

(4) Two light nuclei combine to give a heavier nucleus and  possibly other products

Subtopic:  Mass-Energy Equivalent |
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A gamma ray photon creates an electron- positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be 

(1) 0.78 MeV                 

(2) 1.78 MeV

(3) 1.28 MeV                 

(4) 0.28 MeV

Subtopic:  Mass-Energy Equivalent |
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Which of the following statement is true 

(1) Pt19278 has 78 neutrons

(2) Po21484Pb21082+β-

(3) U23892Th23490+He42

(4) Th23490Pa23491+He42

Subtopic:  Types of Decay |
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