The specific charge of a proton is 9.6 x 107 C/kg. The specific charge of an alpha particle will be
9.6 x107 C/kg
19.2 x 107 C/kg
4.8 x107 C/kg
2.4 x 107 C/kg
Activity of a radioactive sample decreases to (1/3)rd of its original value in 3 days. Then, in 9 days its activity will become
(1/27) of the original value
(1/9) of the original value
(1/18) of the original value
(1/3) of the original value
If r1 and r2 are the radii of the atomic nuclei of mass numbers 64 and 125 respectively, then the ratio ( r1/ r2 ) is
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)