A stationary radioactivity nucleus of mass 210 units disintegrates into an alpha particle of mass 4 units and residual nucleus of mass 206 units. If the kinetic energy of the alpha particles is E, the kinetic energy of the residual nucleus is 

a.  2105 E 

b.  2103 E 

c.  103105 E 

d.  1032 E

Concept Questions :-

Radioactivity
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The mass number of a nucleus is

a.  sometimes equal to its atomic number

b.  sometimes less than and sometimes more than its atomic number

c.  always less than its atomic number

d.  always more than its atomic number

Concept Questions :-

Mass-energy equivalent
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Two nucleons are at a separation of 1 fm. The net force between them is F1 if both are neutrons, F2 if both are protons and F3 if one isproton and other is a neutron. Hence 

1.  F1 > F2 > F3   

2.  F2 > F1 > F3     

3.  F1 = F3 > F2     

4.  F1 = F2 > F3  

Concept Questions :-

Nuclear binding energy
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A radioactivity nucleus X decays to a stable nucleus 'y'. Then the graph of the rate of formation of 'y' against time 't' will be

a.  

b. 

c.   

d.  

Concept Questions :-

Radioactivity
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If the binding energy per nucleon in Li73 and He42 nuclei are respectively 5.60 MeV and7.06 MeV, then the energy of proton in the reaction Li72 + p 22He4 is :

a.  19.6 MeV

b.  2.4 MeV

c.  8.4 MeV

d.  17.3 MeV

Concept Questions :-

Nuclear binding energy
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In the reaction H13 + H13  He24  + n01, if the binding energies of H12, H13, and He24 are respectively a, b, and c in Mev, then the energy in MeV released in this reaction is 

a.  c + a - b

b.  c - a - b

c.  a + b + c

d.  a + b - c

 

Concept Questions :-

Nuclear binding energy
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The radius of germanium (Ge) nuclide is measured to be twice theradius of Be49. The number of nucleons in Ge are

a.  73

b.  74

c.  75

d.  72

Concept Questions :-

Mass-energy equivalent
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A radioactivity sample has 4 x 1010 nuclei at a certain time. The number of active nuclei still remaining after 4 half-lives is

a.  1 x 1010 

b.   5 x 109  

c.  25 x 108  

d.  5 x 108

Concept Questions :-

Radioactivity
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The activity of the radioactivity element decreases to one-third of the original activity A0 in a period of 7 years. After a further lapse of 7 years, its activity will be

a.  A0  

b.  23A0  

c.  A06  

d.  A09

Concept Questions :-

Radioactivity
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Two radioactive substance A and B have decay constant 5λ and λ respectively. At t = 0 they have the same nunmber of nuclei. The ratio of number of nulei of A to those of B will be 1e2 after a time interval

a.  14λ  

b.  4λ  

c.  2λ 

d.   12λ

Concept Questions :-

Radioactivity
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