Half-life of a radioactive substance is 20 min. Difference between points of time when it is 33% disintegrated an 67% disintegrated is approximately 

(1) 10 min            (2) 20 min            (3) 30 min            (4) 40  min

Concept Questions :-

Radioactivity
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When two deuterium nuclei fuse together to form a tritium nuclei, we get a [CPMT 2000]

(1) Neutron          (2) Deutron               (3) α-particle               (4) Proton

Concept Questions :-

Nuclear binding energy
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The most penetrating radiation out of the following is [1997]

(1) y-rays           (2) α-particles             (3) β-rays               (4) X-rays

Concept Questions :-

Types of decay
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In any fission process the ratio mass of fission productsmass of parent nucleus is         [2005]

(1) less than 1

(2) greater  than 1

(3) equal to 1

(4) depends on the mass of parent nucleus

Concept Questions :-

Nuclear binding energy
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The nucleus C48d115, after two successive β-decay will give [1988]

(1) P46a115                          (2) I49n114

(3) S50n113                          (4) S50n115

Concept Questions :-

Types of decay
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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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