If a source of light is approaching us at 3,000 km/sec, then all its waves are:
A)blueshifted by 1%.
B)redshifted by 1%.
C)not affected, as c is constant regardless of the direction of motion.
D)blueshifted out of the visible spectrum into the ultraviolet.
E)redshifted out of the visible into the infrared.

Question

Quizplus · Accepted Answer

When a light source approaches us, its waves appear to have a shorter wavelength due to the Doppler effect, which is perceived as a shift towards the blue end of the spectrum. The specific percentage of the shift depends on the relative speed of the source to the observer. In this case, a speed of 3,000 km/sec (which is about 1% of the speed of light, given that the speed of light is approximately 300,000 km/sec) would result in a blueshift of approximately 1%.

If a Source of Light Is Approaching Us at 3,000