The average binding energy of a nucleon inside an atomic nucleus is about [1989]

(1) 8 MeV            (2) 8 eV            (3) 8 J           (4) 8 erg

Concept Questions :-

Nuclear binding energy
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A nucleus with Z = 92 emits the following in a sequence:

α, β-, β-, α, α, α, α, α, β-,β-, α, β+, β+, α. The Z of the resulting nucleus is [AIEEE 2003]

(1) 74                 (2) 76               (3) 78                (4) 82

Concept Questions :-

Types of decay
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In nuclear fission, the percentage of mass converted into energy is about

a.  1%

b.  0.1%

c.  0.01%

d.  10%

Concept Questions :-

Mass-energy equivalent
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The mass number of helium is 4 and that for suphur is 32. The radius of sulphur nuclei is larger than that of helium by

a.  8

b.  4

c.  2

d.  8

Concept Questions :-

Mass-energy equivalent
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A freshly prepared radioactive source of half-life 2 hrs. emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with the source is

a.  6 hrs.

b.  12 hrs.

c.  24 hrs.

d.  128 hrs.  

Concept Questions :-

Radioactivity
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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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