Atoms and NucleiMassEnergy Relation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  4 of 5
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Question number: 1
» Atoms and Nuclei » MassEnergy Relation
Question
If mass equivalent to one mass of electron is completely converted into energy then determine the energy liberated.
Choices
Choice (4)  Response  

a.  0.51 MeV 

b.  2.12 MeV 

c.  1.51 MeV 

d.  3.12 MeV 

Question number: 2
» Atoms and Nuclei » MassEnergy Relation
Question
On disintegration of one atom of U ^{235} the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 KW. Then
(1) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 ^{16}
(2) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 ^{18}
(3) Decay in mass per hour is 4 ⨯ 10 ^{8} kg
(4) Decay in mass per hour is 4 ⨯ 10 ^{6} kg
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  2 and 4 are correct 

b.  1 and 3 are correct 

c.  1,2 and 3 are correct 

d.  1 and 2 are correct 

Question number: 3
» Atoms and Nuclei » MassEnergy Relation
Question
Energy of each photon obtained in the pair production process will be, if the mass of electron or positron is a. m. u
Choices
Choice (4)  Response  

a.  0.213 MeV 

b.  0.321 MeV 

c.  0.465 MeV 

d.  0.123 MeV 

Question number: 4
» Atoms and Nuclei » MassEnergy Relation
Question
Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m ^{2}. The average distance between the earth and the sun is 1.5 ⨯ 10 ^{n} m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)
Choices
Choice (4)  Response  

a.  4.4 ⨯ 10 ^{9} kg 

b.  7.6 ⨯ 10 ^{14} kg 

c.  3.8 ⨯ 10 ^{12} kg 

d.  3.8 ⨯ 10 ^{14} kg. 
