According to general relativity, a photon emitted by a star
A) loses energy.
B) reduces in frequency.
C) is red-shifted.
D) all of the above
E) none of the above
Answer: D
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In which position(s) of the Moon do we experience the highest high tides?
A) 1 B) 2 C) 3 D) 4 E) 1 and 3 F) 2 and 4
Which would require the greater change in a satellite's orbital speed (8 km/s); slowing down so it crashes into Earth, or speeding up so it escapes Earth?
A) slowing down B) speeding up C) same each way D) need more information
An electric diode is useful for
A) storing electrical energy. B) boosting voltage. C) limiting current. D) voltage modification. E) changing ac to dc.
Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone
Indicate whether the statement is true or false