If a star is moving away from Earth, the Doppler effect will cause the frequency of the star's light to shift to a __________ frequency, causing a __________ shift.

Question

Quizplus · Accepted Answer

If a star is moving away from Earth, the Doppler effect will cause a lowering of the frequency, resulting in a redshift. Therefore, the correct choice is D, lower frequency and redshift. Choice A (higher frequency and redshift) is incorrect because the frequency will decrease, not increase. Choice B (higher frequency and blueshift) is also incorrect, since the star is moving away, not towards us. Choice C (lower frequency and blueshift) is also incorrect because the frequency will lower, but the shift will be red, not blue.

If a Star Is Moving Away from Earth, the Doppler