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 
(a) 0.78 MeV                  (b) 1.78 MeV
(c) 1.28 MeV                  (d) 0.28 MeV

Concept Questions :-

Mass-energy equivalent
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Which of the following statement is true 
(a) Pt19278 has 78 neutrons
(b) Po21484Pb21082+β-
(c) U23892Th23490+He42
(d) Th23490Pa23491+He42

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Types of decay
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Fast neutrons can easily be slowed down by 
(a) The use of lead shielding
(b) Passing them through water
(c) Elastic collisions with heavy nuclei
(d) Applying a strong electric field

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Nuclear reactor
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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

(a) 9×1010 J            (b)  9×1011 J
(c) 9×1012 J            (d) 9×1013 J

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Mass-energy equivalent
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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 
(a) 5.0 MeV                (b) 4.02 MeV
(c) 15.0 MeV               (d) 1.02 MeV

Concept Questions :-

Mass-energy equivalent
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A reaction between a proton and O188 that produces F189 must also liberate 
(a) n10         (b) e01
(c) n01         (d) e10

Concept Questions :-

Mass-energy equivalent
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In the nuclear reaction U23892ThAz+He42 , the values of A and Z are
(a) A = 234, Z = 94              (b) A = 234, Z = 90
(c) A = 238, Z = 94              (d) A = 238, Z = 90

Concept Questions :-

Mass-energy equivalent
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If 200 MeV energy is released in the fission of a single U235 nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given 1 eV=1.6×10-19 J
(a) 3.125×1013           (b) 3.125×1014
(c) 3.125×1015           (d) 3.125×1016

Concept Questions :-

Mass-energy equivalent
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In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best

(a) Slow proton             (b) Fast neutron
(c) Slow neutron           (d) None of these

Concept Questions :-

Mass-energy equivalent
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In the nuclear reaction  X29785Y+4α, Y is 

(a) Y28776             (b) Y28577
(c) Y28177             (d) Y28977

Concept Questions :-

Radioactivity
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