The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of 2He4 is (mass of helium nucleus = 4.0015 u).
28 . 4 MeV
0. 061 u
0 . 0305 J
0 . 0305 erg
Which of the following are suitable for the fusion process?
Light nuclei
Heavy nuclei
Elements lying in the middle of periodic table
Elements lying in the middle of binding energy curve
What is the respective number of α and β- particles emitted in the following radioactive decay.
200X90 → 168Y80 ?
6 and 8
6 and 6
2 MeV
1 KeV
The count rate of a Geiger Muller counter for the radiation of radioactive material of half – life 30 min decreases to 5 s-1 after 2 h. Calculate the initial count rate ?
20 s-1
25s-1
80s-1
625s-1
Consider the reaction , if the binding energies of and are respectively α, b and c (in MeV). then the energy (in MeV) released in this reaciton is:
C + a - b
c - a - b
a + b + c
a + b - c
Half-life of a radioactive substance is 12.5 h and its mass is 256g. After what time, the amount of remaining substance is 1 g?
75h
100h
125 h
150 h
When a deutrium is bombarded on nucleus, an 8O16 nucleus, an α-particle is emitted, then the product nucleus is:
7N13
5B10
4Be9
7N14
Solar energy is mainly caused due to.
fision of protons during synthesis of heavier elements
gravitational contraction
burning of hydrogen in the oxygen
fission of uranium present in the sun
Solar energy is due to
Fusion reaction
Fussion reaction
Combusion reaction
Chemical reaction
The half-life of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr.
1/4
1/2
1/8
