If in nuclear reactor using U235 as fuel, the power output is 4.8 MW, the number of fissions per second is:
(Energy released per fission of U235 = 200 MeV watts, 1 eV = 1.6 X 10–19 J)
1. 1.5×1017
2. 3×1019
3. 1.5×1025
4. 3×1025
The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:
1. Isobar of a parent.
2. Isomer of a parent.
3. Isotone of a parent.
4. Isotope of a parent.
The Binding energy per nucleon of \(^{7}_{3}\mathrm{Li}\) and \(^{4}_{2}\mathrm{He}\) nucleon are \(5.60~\text{MeV}\) and \(7.06~\text{MeV}\), respectively. In the nuclear reaction \(^{7}_{3}\mathrm{Li} + ^{1}_{1}\mathrm{H} \rightarrow ^{4}_{2}\mathrm{He} + ^{4}_{2}\mathrm{He} +Q\), the value of energy \(Q\) released is:
1. \(19.6~\text{MeV}\)
2. \(-2.4~\text{MeV}\)
3. \(8.4~\text{MeV}\)
4. \(17.3~\text{MeV}\)
Fusion reaction takes place at a higher temperature because:
1. | atoms get ionized at high temperatures. |
2. | kinetic energy is high enough to overcome the Coulomb repulsion between nuclei. |
3. | molecules break up at a high temperature. |
4. | nuclei break up at a high temperature. |
Which of the following pairs of nuclei are isotones?
1.
2.
3.
4.
An atomic nucleus emits several and radiations and finally reduces to . It must have emitted:
1. 4 and 2
2. 6 and 4
3. 8 and 24
4. 4 and 16
If an electron and a positron annihilate, then the energy released is:
1.
2.
3.
4.
In nuclear reaction , \(\mathrm {B}\) denotes:
1. Electron
2. Positron
3. Proton
4. Neutron
After two alpha decays and four beta(-ve) decays, the atomic number:
1. | Decreases by 4 and mass number remains same. |
2. | Remains the same but the mass number increases by 4. |
3. | Remains the same but mass number decreases by 8. |
4. | Increases but mass number remains same. |