A neutron with velocity V strikes a stationary deuterium atom. Its kinetic energy changes by a factor of 
(a) 1516              (b) 12
(c) 21                (d) None of these

Concept Questions :-

Mass-energy equivalent
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The sun radiates energy in all directions. The average radiations received on the earth surface from the sun is 1.4 kilowatt/m2.The average earth- sun distance is 1.5×1011 metres. The mass lost by the sun per day is
(1 day = 86400 seconds) 
(a) 4.4×109 kg          (b) 7.6×1014 kg
(c) 3.8×1012 kg         (d) 3.8×1014 kg

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Mass-energy equivalent
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The binding energy per nucleon of O16 is 7.97 MeV and that of O17 is 7.75 MeV. The energy (in MeV) required to remove a neutron from O17 is 
(a) 3.52                 (b) 3.64
(c) 4.23                 (d) 7.86

Concept Questions :-

Nuclear binding energy
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The rest energy of an electron is 0.511 MeV. The electron is accelerated from rest to a velocity 0.5 c. The change in its energy will be
(a) 0.026 MeV            (b) 0.051 MeV
(c) 0.079 MeV            (d) 0.105 MeV

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Mass-energy equivalent
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For uranium nucleus how does its mass vary with volume

(a) mV           (b) m1/V
(c)  mV       (d) mV2

Concept Questions :-

Radioactivity
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The rest mass of an electron as well as that of positron is 0.51 MeV. When an electron and positron are annihilated, they emit photon of wavelength(s)-

1. 0.012 Å               

2. 0.024 Å

3. 0.012 Å to      

4. 0.024 Å to 

Concept Questions :-

Mass-energy equivalent
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In the nuclear fusion reaction H12+H13He24+n given that the repulsive potential energy between the two nuclei is -7.7×10-14 J, the temperature at which the gases must be heated to initiate the reaction is nearly
[Boltzmann’s constant k=1.38×10-23 J/K)
(a)109 K            (b) 107 K
(c) 105 K           (d)  103 K

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Mass-energy equivalent
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A nucleus with mass number 220 initially at rest emits an α-particle. If the Q value of the reaction is 5.5 MeV, calculate the kinetic energy of the α-particle

(a) 4.4 MeV             (b) 5.4 MeV
(c) 5.6 MeV             (d) 6.5 MeV

Concept Questions :-

Types of decay
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The half life of radioactive Radon is 3.8 days. The time at the end of which 1/20 th of the Radon sample will remain undecayed is
(Given log10e=0.4343
(a) 3.8 days               (b) 16.5 days
(c) 33 days                (d) 76 days

Concept Questions :-

Radioactivity
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If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately
(a) 60%              (b) 65%
(c) 70%              (d) 75%

Concept Questions :-

Radioactivity
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