Modern Physics Ques 43
Passage
In a mixture of ${H-He^{+}}^{\text {gas }}\left(He^{+}\right.$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 quantum number $n$ of the state finally populated in $He^{+}$ ions is
$(2008,4$ M)
(a) $ 2$
(b) $ 3$
(c) $ 4$
(d) $ 5$
Show Answer
Answer:
Correct Answer: 43.(c)
Solution:
Formula:
Wavelength Corresponding To Spectral Lines:
Energy given by $H$-atom in transition from $n=2$ to $n=1$ is equal to energy taken by $He^{+}$atom in transition from $n=2$ to $n=4$.
BETA
