A nucleus emits 9 -particles and 5 particles. The ratio of total protons and neutrons in the final nucleus is:
1.
2.
3.
4.
=Calculate the Q-value of the nuclear reaction:
\(2~{ }_{6}^{12} \mathrm{C}\rightarrow{ }_{10}^{20} \mathrm{Ne}+{ }_2^4 \mathrm{He}\)
The following data are given:
\(m({ }_{6}^{12} \mathrm{C})=12.000000~\text{u}\)
\(m({ }_{10}^{20} \mathrm{Ne})=19.992439~\text{u}\)
\(m({ }_{2}^{4} \mathrm{He})=4.002603~\text{u}\)
1. \(3.16~\text{MeV}\)
2. \(5.25~\text{MeV}\)
3. \(3.91~\text{MeV}\)
4. \(4.65~\text{MeV}\)
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
An element \(X\) decays, first by positron emission, and then two \(\alpha\text-\)particles are emitted in successive radioactive decay. If the product nuclei have a mass number \(229\) and atomic number \(89\), the mass number and the atomic number of element \(X\) are:
1. \(237,~93\)
2. \(237,~94\)
3. \(221,~84\)
4. \(237,~92\)
If ratio in a nucleus is smaller than the required value for stability, then:
1. | It may emit α -particle. |
2. | It may emit β + particle. |
3. | It may go for K capture. |
4. | All of the above are possible. |
Determine the energy released in the process:
Given: M = 2.01471 amu
M= 4.00388 amu
1. 3.79 MeV
2.13.79 MeV
3. 0.79 MeV
4. 23.79 MeV
Two nuclei have their mass numbers in the ratio of \(1:3.\) The ratio of their nuclear densities would be:
1. \(1:3\)
2. \(3:1\)
3. \((3)^{1/3}:1\)
4. \(1:1\)
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.
A nucleus \({ }_{{n}}^{{m}} {X}\) emits one \(\alpha\text -\text{particle}\) and two \(\beta\text- \text{particle}\) The resulting nucleus is:
1. \(^{m-}{}_n^6 Z \)
2. \(^{m-}{}_{n}^{4} X \)
3. \(^{m-4}_{n-2}Y\)
4. \(^{m-6}_{n-4} Z \)
Consider the following statements:
I. | All isotopes of elements have the same number of neutrons. |
II. | Only one isotope of an element can be stable and non-radioactive. |
III. | All elements have isotopes. |
IV. | All isotopes of carbon can form chemical compounds with oxygen-16. |
The correct option regarding an isotope is:
1. | (III) and (IV) only |
2. | (II), (III), and (IV) only |
3. | (I), (II), and (III) only |
4. | (I), (III), and (IV) only |