Question

The H${}_{\alpha }$ line of hydrogen

• A. has a wavelength smaller than that of the $H_{\beta }$ line
• B. has a wavelength $4860\mathring{A}$
• C. is emitted in the transition from the second excited state to the first excited state
• D. has a wavelength $6060\mathring{A}$.

Answer 1

Answer: (C)

$H_{\alpha }$ line is emitted, when the electron jumps from the $n=3$
orbit (second excited state) to the $n=2$ orbit (first excited state).
And $H_{\beta }$ line is also emitted,
when the electron jumps from the $n=4$
orbit to the $n=2$ orbit.