The binding energy per nucleon is maximum in the case
C.
We know that binding energy per nucleon increases with atomic number binding energy for iron is maximum, after that it decreases.
The half-life of radio isotope is 4 h. If initial mass of the isotope was 200 g, then mass remaining after 24 h will be
1.042 g
2.084 g
3.125 g
4.167 g
Remaining quantity (in%) of radioactive element after 5 half lives is
4.125%
3.125%
31.1%
42.125%
The half-life of 198Au is 2.7 days. The average life is
4 days
3.4 days
3.9 days
None of the above
If MO is the mass of an oxygen isotope 8O17 Mp and Mn are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is
MO c2
( MO - 17Mn ) c2
(MO - 8Mp ) c2
( 8 Mp + 9 Mn - MO)
A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2 : 1. The ratio of their nuclear size will be
21/3 : 1
1 : 31/2
31/2 : 1
1 : 21/2
A block having 12g of element is placed in a room. This element is a radioactive element with half-life of 15 yr. After how many years will there be just 1.5 g of the element in the box?
40 yr
45 yr
20 yr
15 yr
A7 Li target is bombarded with a proton beam current of 10-4 A for one hour to produce 7Be of activity 1.8 × 108 disintegrations per second. Assuming that one 7Be radioactive nuclei is produced by bombarding 1000 protons, its half-life is
0.87 × 107 s
0.2 × 107 s
0.67 × 108 s
0.87 × 106 s
Two radioactive materials X1 and X2 have decay constants 6 and 3A respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of X2 will be after a time