The energy required in \(\text{MeV/c}^2 \) to separate \({ }_8^{16} \mathrm{O}\) into its constituents is:
(Given: mass defect for \({ }_8^{16} \mathrm{O}=0.13691~ \text{amu}\))
1. | \(127.5\) | 2. | \(120.0\) |
3. | \(222.0\) | 4. | \(119.0\) |
The mass number of a nucleus is:
1. | always less than its atomic number. |
2. | always more than its atomic number. |
3. | sometimes equal to its atomic number. |
4. | sometimes less than and sometimes more than its atomic number. |
1. | \(0.0305\) J | 2. | \(0.0305\) erg |
3. | \(28.4\) MeV | 4. | \(0.061\) u |
A sample of a radioactive element has a mass of 10 gm at an instant t = 0. The approximate mass of this element in the sample after two mean lives is:
1. 1.35 gm
2. 2.50 gm
3. 3.70 gm
4. 6.30 gm
The half-life of a sample of a radioactive element containing 4 × 1016 active nuclei, is 10 days. The number of decayed nuclei after 30 days will be:
1.
2.
3.
4.
Which of the following are suitable for the fusion process?
1. | light nuclei |
2. | heavy nuclei |
3. | the element must be lying in the middle of the periodic table |
4. | middle elements which are lying on the binding energy curve |
If the half-life of a radionuclide is 77 days, then its decay constant is:
1. 0.003/day
2. 0.006/day
3. 0.009/day
4. 0.012/day
1. | \(Z\) protons and \(A-Z\) neutrons |
2. | \(Z\) protons and \(A\) neutrons |
3. | \(A\) protons and \(Z-A\) neutrons |
4. | \(Z\) neutrons and \(A-Z\) protons |