As a star moves further from Earth, we see a lower frequency wavelength. This is called a ______ effect
Doppler effect
As a star moves further from Earth, we see a lower frequency wavelength. This is called a redshift effect.
This phenomenon is called the "Doppler effect." The Doppler effect describes the apparent change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the wave.
To understand the Doppler effect in the context of stars moving further from Earth, we need to consider that light is a type of electromagnetic wave that can be described by its frequency or wavelength. When a star is moving away from Earth, the wavelengths of the light waves emitted by the star appear longer (i.e., the frequencies appear lower) to an observer on Earth. Conversely, if a star is moving towards Earth, the wavelengths of the light waves appear shorter (i.e., the frequencies appear higher) to an observer.
The Doppler effect can be experienced not only with light waves but also with other types of waves, such as sound waves. For example, it is the reason why the pitch of an ambulance siren sounds higher as it approaches an observer and lower as it moves away.