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

Concept Questions :-

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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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

Concept Questions :-

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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A radioactive isotope X with a half-life of 1.37×109 years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1 : 7. The age of the rock is
(a) 1.96×108 years         (b) 3.85×109 years
(c) 4.11×109years          (d) 9.59×109 years

Concept Questions :-

Radioactivity
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From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is

(a) 6 hours            (b) 12 hours
(c) 24 hours          (d) 128 hours

Concept Questions :-

Radioactivity
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The half life of radium is 1620 years and its atomic weight is 226 kgm per kilomol. The number of atoms that will decay from its 1 gm sample per second will be

(a) 3.61×1010     (b) 3.6×1012
(c) 3.11×1015     (d) 31.1×1015

(Avogardo's number N = 6.02×1026 atpm/kilomol)

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