The Hγ line has a wavelength of 434.0 nm when observed in the laboratory. If the Hγ line appears in the spectrum of a star moving away from you, at what wavelength will you observe the line?

Question

Quizplus · Accepted Answer

When a star is moving away from an observer, the light it emits experiences a redshift, meaning the observed wavelength is longer (greater) than the wavelength measured in the laboratory. This is due to the Doppler effect.

The Hγ Line Has a Wavelength of 434