According to the Doppler effect, what appears to happen when a light source moves closer to an observer?
Responses
The electromagnetic waves appear more red in color.
The electromagnetic waves appear more red in color.
The electromagnetic waves appear more blue in color.
The electromagnetic waves appear more blue in color.
The waves stretch and frequency appears to increase.
The waves stretch and frequency appears to increase.
The waves stretch and frequency appears to decrease.
The waves stretch and frequency appears to decrease.