1. | It may emit \(\alpha\text-\)particle. |
2. | It may emit \(\beta^{+}\) particle. |
3. | It may go for \(K\) capture. |
4. | All of the above are possible. |
If the activity of a radioactive sample drops to 1/32 of its initial value after 7.5 Hours, its half-life will be:
1. 3 Hours
2. 4.5 Hours
3. 7.5 Hours
4. 1.5 Hours
1. | Neutrons | 2. | Alpha particles |
3. | Beta particles | 4. | Gamma photons |
1. | \(1.5\times 10^{17}\) | 2. | \(3\times 10^{19}\) |
3. | \(1.5\times 10^{25}\) | 4. | \(3\times 10^{25}\) |
1. | \(\dfrac{(Z - 13)}{\left(A - Z - 23\right)}\) | 2. | \(\dfrac{\left(Z - 18\right)}{\left(A - 36\right)}\) |
3. | \(\dfrac{\left(Z - 13\right)}{\left(A - 36\right)}\) | 4. | \(\dfrac{\left(Z - 13\right)}{\left(A - Z - 13\right)}\) |
90% of a radioactive sample is left undecayed after time t has elapsed. What percentage of the initial sample will decay in a total time 2t?
1. 20%
2. 19%
3. 40%
4. 38%
An element \(\mathrm{X}\) 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 \(\mathrm{X}\) are:
1. \(237,~93\)
2. \(237,~94\)
3. \(221,~84\)
4. \(237,~92\)
1. | \(6\) and \(8\) | 2. | \(6\) and \(6\) |
3. | \(8\) and \(8\) | 4. | \(8\) and \(6\) |