In the nuclear decay given below

XzA  YZ + 1A  B*Z - 1A - 4  BZ - 1A - 4,

The particles emitted in the sequence are 

a.  β, α, γ  

b.  γ, β, α  

c.  β, γ, α  

d.  α, β, γ

Concept Questions :-

Types of decay
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In compound Xn,a  Li73, the element X is

a.  He42  

b.  B105  

c.  B95  

d.  Be114

Concept Questions :-

Mass-energy equivalent
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The numbers of Na2311, the number of protons, neutrons and electrons are

a.  11, 12, 0

b.  23, 12, 11

c.  12, 11, 0

d.  23, 11, 12

Concept Questions :-

Mass-energy equivalent
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A thorium nucleus is formed when a uranium nucleus emits an α - particle. The atomic number of thorium is

a.  92

b.  90

c.  82

d.  94

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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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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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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 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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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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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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