Question

select the correct answer. which effect explains the observable change in wavelength and frequency of a wave when the source is moving either toward or away from an observer absorption spectra doppler effect emission spectra continuous spectra

Explanation:

The Doppler effect occurs when there is relative motion between a wave source and an observer. This motion causes a change in the observed wavelength and frequency of the wave. Absorption spectra refer to dark lines in a spectrum where light has been absorbed. Emission spectra are bright lines from emitted light. Continuous spectra have a continuous range of wavelengths without gaps. Only the Doppler effect directly relates to the change in wavelength and frequency due to source - observer motion.

Answer:

Doppler effect