Suppose we have a weightless light source that is moving. Its output light will therefore undergo a Doppler shift. Now, if the lightsource had weight but were static, its light would undergo a red shift. If the light source had weight and were moving, would it undergo both a red shift and a Doppler shift, with the end frequency being the linear superposition of both effects?
- The relative velocity of the transmitter and recepient is the same, will the apparent Doppler shift be zero?
- If the weight of both the transmitter and the recepient is the same, will the apparent red/blue shift be zero?