Which of the following is true about blue-shifted light that we detect from the cosmos?
A) It signifies a source that is moving toward us.
B) It is common for galaxies to emit this type of light.
C) The detected light has a longer wavelength than at the source.
D) The detected light has a lower frequency than at the source.

Question

Quizplus · Accepted Answer

Blue-shifted light indicates that the source of the light is moving towards us. This is due to the Doppler effect, which causes the wavelength of light to appear shorter and the frequency to appear higher as the source moves towards the observer. Galaxies emitting blue-shifted light are relatively rare and are usually associated with objects that exhibit high-speed motion, such as supernovae or galaxies undergoing gravitational interactions. The detected light has a shorter wavelength and a higher frequency than at the source, not a longer wavelength and lower frequency.

Which of the Following Is True About Blue-Shifted Light That