<p>The nucleus <sub>6</sub>C<sup>12</sup> absorbs an energetic neutron and emits a beta particle ( β ). The resulting nucleus is</p>
7N14
7N13
5B13
6C13
The constituents of atomic nuclei are believed to be
neutrons and protons
protons only
electrons and protons
electrons, protons and neutrons
The energy equivalent of one atomic mass unit is:
1.6 × 10-19 J
6.02 × 1023J
931 MeV
9.31 MeV
The average binding energy of a nucleon inside an atomic nucleus is about
8 MeV
8 eV
8 J
8 erg
The half-life of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is
1/4
1/2
1/8
1/16
The nucleus 48Cd115, after two successive β-decay will give
46Pa115
49In114
<p><sub>50</sub>Sn<sup>113</sup></p>
<p><sub>50</sub>Sn<sup>115</sup></p>
Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is
To control energy released in the reactor
To absorb neutrons and stop chain reaction
To cool the reactor
To slow down the neutrons to thermal energies
What is the radius of iodine atom? (atomic No.53, Mass No.126)
2.5 × 10-11 m
2.5 × 10-9 m
7 × 10-9 m
7 × 10-6 m
In a given reaction:
Radioactive radiations are emitted in the sequence of
α, β, γ
γ, β, α
γ, α, β
β, α, γ
Which of the following statements is true for nuclear forces?
They obey the inverse square law of distance.
They obey the inverse third power law of distance.
They are short range forces.
They are equal in strength to electromagnetic forces.
