alleryFor hydrogen, wavelength emitted in n=3 to n=2 transition (Balmer):
ALyman alpha at 121 nm
BUV at 100 nm
CBalmer alpha at 656 nm (red, in visible)
DIR at 1875 nm
Answer & Solution
Correct answer: C. Balmer alpha at 656 nm (red, in visible)
**Balmer series:** transitions ending at n=2. n=3 to 2 is Hα (Balmer alpha), wavelength 656 nm (red, visible).
The red color of hydrogen plasma comes from this line.
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