The _________________ refers to the change in wavelength (and,therefore,frequency)of waves that happens if the source of the waves is moving.
A) Big Bang theory
B) Nebular theory
C) Expanding Universe theory
D) Doppler effect

Question

The _________________ refers to the change in wavelength (and,therefore,frequency)of waves that happens if the source of the waves is moving. 
A) Big Bang theory 
B) Nebular theory 
C) Expanding Universe theory 
D) Doppler effect

Quizplus · Accepted Answer

The Doppler effect is the phenomenon that explains the change in wavelength or frequency of waves (such as light or sound) if the source of the waves is moving relative to the observer. This effect is used in astronomy to determine the speed and direction of objects in space, such as stars and galaxies. The other choices (A, B, C) are theories in astronomy but are not directly related to the Doppler effect.

The _________________ Refers to the Change in Wavelength (And,therefore,frequency)of Waves