A dark line at wavelength 486 nm is seen in the absorption spectrum of a cool…
PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation
Problem
A dark line at wavelength 486 nm is seen in the absorption spectrum of a cool hydrogen gas cloud situated between a white-light source and an observer. Do the electrons in the hydrogen atoms move to a higher or a lower energy state when this line is produced? Explain briefly.