The energy equivalent of \(0.5\) g of a substance is:
1. \(4.5\times10^{13}\) J
2. \(1.5\times10^{13}\) J
3. \(0.5\times10^{13}\) J
4. \(4.5\times10^{16}\) J
When a uranium isotope \(_{92}^{235}\mathrm{U}\) is bombarded with a neutron, it generates \(_{36}^{89}\mathrm{Kr}\) three neutrons and:
1. | \(_{40}^{91}\mathrm{Zr}\) | 2. | \(_{36}^{101}\mathrm{Kr}\) |
3. | \(_{36}^{103}\mathrm{Kr}\) | 4. | \(_{56}^{144}\mathrm{Ba}\) |
What happens to the mass number and the atomic number of an element when it emits \(\gamma\text{-}\)radiation?
1. | mass number decreases by four and atomic number decreases by two. |
2. | mass number and atomic number remain unchanged. |
3. | mass number remains unchanged while the atomic number decreases by one. |
4. | mass number increases by four and the atomic number increases by two. |
The binding energy per nucleon in deuterium and helium nuclei are \(1.1\) MeV and \(7.0\) MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is:
1. \(2.2\) MeV
2. \(28.0\) MeV
3. \(30.2\) MeV
4. \(23.6\) MeV
Boron has two isotopes and . If atomic weight of Boron is 10.81 then ratio of to in nature will be:
1. 15 : 16
2. 19: 81
3. 81 : 19
4. 20: 53
For the given reaction, the particle \(X\) is:
\({ }_6^{11} \mathrm{C}\rightarrow { }_5^{11}\mathrm{B}+\beta^{+}+X\)
1. neutron
2. anti neutrino
3. neutrino
4. proton
In any fission process the ratio
1. Greater than 1
2. Depends on the mass of the parent nucleus
3. Equal to 1
4. Less than 1
Fission of nuclei is possible because the binding energy per nucleon in them:
1. | decreases with the mass number at low mass numbers |
2. | increases with the mass number at low mass numbers |
3. | decreases with the mass number at high mass numbers |
4. | increases with the mass number at high mass numbers |
Nuclear – fission is best explained by:
1. Liquid droplet theory
2. Yukawa - meson theory
3. Independent particle model of the nucleus
4. Proton-proton cycle