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 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)