When light is gravitationally red or blue shifted, that which is shifted is
1) wave frequency,
2) wavelength,
3) wave energy,
4) all of these,
5) none of these,
and when light is Doppler shifted, that which is shifted is actually
6) wave frequency.
7) wave amplitude.
8) both of these.
9) none of these.
Answer: 4, 6
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