A. | slow neutrons can cause fission in \(U_{92}^{235}\) than fast neutrons. |
B. | \(\text{α-rays}\) are helium nuclei. |
C. | \(\text{β-rays}\) are fast-moving electrons or positrons. |
D. | \(\gamma\text-\text{rays}\) are electromagnetic radiations of wavelengths larger than \(X\text-\)rays. |
1. | \(25:16\) | 2. | \(1:1\) |
3. | \(4:5\) | 4. | \(5:4\) |
1. | \({ }_{12}^{22} \mathrm{Mg}\) | 2. | \({ }_{11}^{23} \mathrm{Na}\) |
3. | \({ }_{10}^{23} \mathrm{Ne}\) | 4. | \(_{10}^{22}\textrm{Ne}\) |
1. | \(\beta^{+}, ~\alpha, ~\beta^{-}\) | 2. | \(\beta^{-}, ~\alpha, ~\beta^{+}\) |
3. | \(\alpha, ~\beta^{-},~\beta^{+}\) | 4. | \(\alpha, ~\beta^{+},~\beta^{-}\) |
A nucleus with mass number \(240\) breaks into fragments each of mass number \(120\). The binding energy per nucleon of unfragmented nuclei is \(7.6~\text{MeV}\) while that of fragments is \(8.5~\text{MeV}\). The total gain in the binding energy in the process is:
1. \(804~\text{MeV}\)
2. \(216~\text{MeV}\)
3. \(0.9~\text{MeV}\)
4. \(9.4~\text{MeV}\)
If a \({}_{a}^{b}\mathrm{X}\) species emits firstly a positron, then two \(\alpha\) and two \(\beta\) and at last one \(\alpha\) is also emitted and finally convert into stable \({}_{d}^{c}\mathrm{Y}\) species, so the correct relation will be:
1. \(c = b-12, d = a-5\)
2. \(a = c-8, d = b-1\)
3. \(a = c-6, d = b-0\)
4. \(a = c-4, a = b-2\)