If a source of light is moving away at 10% the speed of light, its wavelength will
A)be lengthened by 22%.
B)be lengthened by 11%.
C)be shortened by 22%.
D)be shortened by 11%.
E)remain unchanged.

Question

Quizplus · Accepted Answer

When a source of light moves away from an observer, the light experiences a redshift, meaning its wavelength is lengthened. The relativistic Doppler effect formula shows that at 10% the speed of light, the wavelength is lengthened by approximately 11%.

If a Source of Light Is Moving Away at 10