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
What is the respective number of α and β particles emitted in the following radioactive decay
200X90 → 168Y80?
6 and 8
6 and 6
8 and 8
8 and 6
The average binding energy of a nucleon inside an atomic nucleus is about
8 MeV
8 eV
8 J
8 erg
Energy released in the fission of a single 92U235 nucleus is 200 MeV. The fission rate of a 92U235 filled reactor operating at a power level of 5 W is
1.56 x 10-10 s-1
1.56 x 1011 s-1
1.56 x 10-16 s-1
1.56 x 10-17 s-1
A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2 :1. What will be the ratio of their nuclear size (nuclear radius)?
21/3 : 1
1 : 21/3
31/2 : 1
1 : 31/2
The activity of a radioactive sample is measured as 9750 counts/min at t = 0 and as 975 counts/min at t = 5 min. The decay constant is approximately
0.922/min
0.691/min
0.461/min
0.230/min
An element A decays into element C by a two step process
Then
A and C are isotopes
A and C are isobars
A and B are isotopes
A and B are isobars
If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by Fpp, Fnn and Fpn respectively, then
Fpp ≈ Fnn ≈ Fpn
Fpp ≠ Fnn and Fpp = Fnn
Fpp = Fnn = Fpn
Fpp ≠ Fnn ≠ Fpn
The binding energy per nucleon is maximum in case of
2He4
26Fe56
56Ba141
92U235
The mass density of a nucleus varies with mass number A as
A2
A
constant
1/A
