A certain spectral line of rest wavelength l_rest(i.e., laboratory value) is shifted by 100 nm in a quasar.A second line from the same quasar with a rest wavelength half the (rest) value of the first one would be shifted by A) 200 nm. B) 100 nm. C) 500 nm. D) 50 nm. E) 1000 nm.

Question

Quizplus · Accepted Answer

The redshift is the same for both lines, so the shift is proportional to the rest wavelength. Since the second line has half the rest wavelength of the first, its shift will be half of 100 nm, which is 50 nm.

A Certain Spectral Line of Rest Wavelength Lrest (i

A Certain Spectral Line of Rest Wavelength L_rest(i