In a mixture of H - He$$^+$$ gas (He$$^+$$ is singly ionized He atom), H atoms and He$$^+$$ ions are excited to their respective first excited states. Subsequently, H atoms transfer their total excitation energy to He$$^+$$ ions (by collisions). Assume that the Bohr model of atom is exactly valid.
The ratio of the kinetic energy of the $$n=2$$ electron for the H atom to that of He$$^+$$ ion is
In the option given below, let E denote the rest mass energy of a nucleus and n a neutron. The correct option is
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
$$ \text { Match the following Columns. } $$
| Column I | Column II | ||
|---|---|---|---|
| (A) | Nuclear fusion. | (P) | Converts some matter into energy. |
| (B) | Nuclear fission. | (Q) | Generally possible for nuclei with low atomic number. |
| (C) | $\beta$-decay. | (R) | Generally possible for nuclei with higher atomic number. |
| (D) | Exothermic nuclear reaction. | (S) | Essentially proceeds by weak nuclear forces. |
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