If an artificial satellite is orbiting about the Earth, between the Earth and the moon, how does its period of rotation compare to the moon’s period?
A. greater.
B. the same.
C. less.
D. don’t have enough information, depends on the satellite’s speed
E. don’t have enough information, depends on the satellite’s mass
C. less.
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Annual meteor showers such as the Perseids in August are caused by ________.
A. Earth passing through the debris left behind by a comet as we cross its orbit B. the breakup of asteroids that hit our atmosphere at predictable times C. passing asteroids triggering auroral displays D. nuclear reactions in the upper atmosphere triggered by meteoritic particle storms
If wavelengths of emitted light become longer, the energy per photon of light
A) increases. B) remains constant. C) decreases. D) none of the above
What are gravitational waves?
A) a type of energy that is different from light and that has been detected from sources such as merging neutron stars and black holes B) a form of light with higher energy than gamma rays C) a form of light with lower energy than radio waves D) the name we give to electromagnetic waves that come from astronomical objects that have gravity
Light travels faster in
A) thin air. B) dense air. C) same in each.