Intensity: Which one of the following expressions is the correct representation for the speed of light in vacuum?
A. 
B. 
C. 
D. 1 / 
E. 1 / ?0?0
Answer: D
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Indicate whether the statement is true or false
Some people wish that we lived in a recollapsing universe that would eventually stop expanding and start contracting. For this to be the case, which of the following would have to be true (based on current understanding)?
A) Dark energy is the dominant form of energy in the cosmos. B) Dark energy does not exist and there is much more dark matter than we are aware of to date. C) Neither dark energy nor dark matter really exist. D) Dark energy exists but dark matter does not.
Do like magnetic poles repel or attract?
What will be an ideal response?
A spiral galaxy has a small bright central region and its spectrum shows that it contains hot, rapidly moving gas. It is most likely a ________ galaxy.
A. BL Lac B. barred spiral C. Seyfert D. quasar E. radio