What happens to the mass number and the atomic number of an element when it emits \(\gamma\text{-}\)radiation?
1. | mass number decreases by four and atomic number decreases by two. |
2. | mass number and atomic number remain unchanged. |
3. | mass number remains unchanged while the atomic number decreases by one. |
4. | mass number increases by four and the atomic number increases by two. |
For the given reaction, the particle \(\mathrm{X}\) is:
\({ }_6^{11} \mathrm{C}\rightarrow { }_5^{11}\mathrm{B}+\beta^{+}+\mathrm{X}\)
1. neutron
2. anti-neutrino
3. neutrino
4. proton
1. | \({}_{26}^{89}\mathrm{Kr}\) | 2. | \({}_{36}^{89}\mathrm{Kr}\) |
3. | \({}_{26}^{90}\mathrm{Sr}\) | 4. | \({}_{38}^{89}\mathrm{Sr}\) |
1. | \( m_3=\left|m_1-m_2 \right|\) | 2. | \( m_3<\left ( m_1+m_2 \right ) \) |
3. | \( m_3>\left ( m_1+m_2 \right ) \) | 4. | \( m_3=\left ( m_1+m_2 \right ) \) |
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 |
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 |
1. | \(0.0305\) J | 2. | \(0.0305\) erg |
3. | \(28.4\) MeV | 4. | \(0.061\) u |
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. |