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 |
 70%
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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 |
 74%
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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 |
 81%
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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 |
 82%
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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 |
 91%
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Fast neutrons can easily be slowed down by 

(1) The use of lead shielding

(2) Passing them through heavy water

(3) Elastic collisions with heavy nuclei

(4) Applying a strong electric field

Subtopic:  Nuclear Energy |
 81%
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When U23592 undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of U23592 undergoes fission

(1) 9×1010 J           

(2)  9×1011 J

(3) 9×1012 J           

(4) 9×1013 J

Subtopic:  Mass-Energy Equivalent |
 65%
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γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than 

(1) 5.0 MeV               

(2) 4.02 MeV

(3) 15.0 MeV               

(4) 1.02 MeV

Subtopic:  Mass-Energy Equivalent |
 64%
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A reaction between a proton and O188 that produces F189 must also liberate 

(1) n10         

(2) e01

(3) n01         

(4) e10

Subtopic:  Mass-Energy Equivalent |
 57%
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