Assertion (A): | \(\beta^{-} \text-\) particles. | Radioactive nuclei emits
Reason (R): | Electrons exist inside the nucleus. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | Isotopes of an element can be separated by using a mass spectrometer. |
Reason (R): | Separation of isotopes is possible because of the difference in electron numbers of isotopes. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
A. | volume of the nucleus is directly proportional to the mass number. |
B. | volume of the nucleus is independent of mass number. |
C. | density of the nucleus is directly proportional to the mass number. |
D. | density of the nucleus is directly proportional to the cube root of the mass number. |
E. | density of the nucleus is independent of the mass number. |
1. | (A) and (D) only. |
2. | (A) and (E) only. |
3. | (B) and (E) only. |
4. | (A) and (C) only. |
1. | decrease continuously with mass number. |
2. | first decreases and then increases with an increase in mass number. |
3. | first increases and then decreases with an increase in mass number. |
4. | increases continuously with mass number. |
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 |