A radioactive sample with a half-life of 1 month has the label: ‘Activity = 2 microcurie on 1 – 8 – 1991’. What would be its activity two months earlier?
1.0 microcurie
0.5 microcurie
4 microcurie
8 microcurie
Atomic weight of Boron is 10.81 and it has two isotopes . Then the ratio of atoms of in nature would be :
19.81
10.11
15.16
81.19
The binding energy per nucleon for the parent nucleus is E1 and that for the daughter nuclei is E2. Then
E2 = 2E1
E1 > E2
E2 > E1
E1 = 2E2
A radioactive series is 92U238 → 82Pb206. How many α and β -particles re emitted?
8α, 6β
10β, 6α
8α, 8β
12α, 6β
Isotope of parent
After two hours, one sixteenth of the starting amount of a certain radioactive isotope remained undecayed. Calculate half- life of the isotope ?
15 minutes
30 minutes
45 minutes
1 hour
The nucleus 48Cd115, after two successive β-decay will give
46Pa115
49In114
50Sn113
50Sn115
The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nuclei is larger than that of helium by :
√8
4
2
8
In any fission process the ratio is
less than 1
Greater than 1
Equal to 1
Depends on the mass of parent nucleus
In the reaction if the binding energies of are respectively, a, b and c (in MeV), then the energy released duringn the reaction is :
c + a - b
c - a - b
a + b + c
a + b - c
