In nuclear fission process, energy is released because [2001]

(1) mass of products is more than mass of nucleus.

(2) total binding energy of products formed due to nuclear fission is more than that the parent fissionable material.

(3) total binding energy of products formed due to nuclear fission is less than parent fissionable material.

(4) mass of some particles is converted into energy.

Concept Questions :-

Nuclear binding energy
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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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