Q. No.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
In nuclear fission, the percentage of mass converted into energy is about
1. 1%
2. 0.1%
3. 0.01%
4. 10%
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
1. √8
2. 4
3. 2
4. 8
In the nuclear decay given below
XAz → YAZ + 1 → B*A - 4Z - 1 → BA - 4Z - 1,
The particles emitted in the sequence are
1. β, α, γ
2. γ, β, α
3. β, γ, α
4. α, β, γ
In the nucleus of N2311a, the number of protons, neutrons and electrons are:
1. 11, 12, 0
2. 23, 12, 11
3. 12, 11, 0
4. 23, 11, 12
A thorium nucleus is formed when a uranium nucleus emits an α - particle. The atomic number of thorium is
1. 92
2. 90
3. 82
4. 94
The activity of the radioactive element decreases to one-third of the original activity A0 in a period of 7 years. After a further lapse of 7 years, its activity will be:
1. A0
2. 23A0
3. A06
4. A09
The radius of Germanium (Ge) nuclide is measured to be twice the radius of Be94. The number of nucleons in Ge is:
1. 73
2. 74
3. 75
4. 72
if the binding energies of 21H,31H, and 42He are respectively a,b, and c (in MeV), then the energy in (MeV) released in this reaction is:
1. c+a−b
2. c−a−b
3. a+b+c
4. a+b−c
A radioactive nucleus X decays to a stable nucleus 'y'. The graph of the rate of formation of 'y' against time 't' will be:
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