When electromagnetic radiation (e.g., light) is Doppler-shifted by motion of the source away from the detector, the measured
A) speed of the radiation is less than the emitted speed.
B) frequency is higher than the emitted frequency.
C) frequency of the radiation remains the same, but its wavelength is shortened, compared to the emitted radiation.
D) wavelength is longer than the emitted wavelength.

Question

Quizplus · Accepted Answer

The Doppler effect causes the wavelength of electromagnetic radiation to lengthen (redshift) when the source is moving away from the observer, leading to a lower observed frequency but the speed of light remains constant in a vacuum.

When Electromagnetic Radiation (E