The ratio of the radii of the nuclei 13Al27 and 52Te125 is approximately
6 :10
13 : 52
40 : 177
14 : 73
The constituents of atomic nuclei are believed to be
neutrons and protons
protons only
electrons and protons
electrons, protons and neutrons
In the nucleus of 11Na23, the number of protons, neutrons and electrons are
11, 12, 0
23, 12, 11
12, 11, 0
23, 11, 12
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.
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>
Solar energy is due to
Fusion reaction
Fission reaction
Combustion reaction
Chemical reaction
The energy equivalent of one atomic mass unit is:
1.6 × 10-19 J
6.02 × 1023J
931 MeV
9.31 MeV
In a given reaction:
Radioactive radiations are emitted in the sequence of
α, β, γ
γ, β, α
γ, α, β
β, α, γ
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
