A very energetic event like a supernova would emit mostly ________ light.
A. white
B. infrared
C. radio
D. visible
E. X-ray
Answer: E
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T and b quarks are named
a. truth and beauty b. up and down c. top and bottom d. Itchy and Scratchy e. none of the above
A night vision camera
A. can only detect green photons, which reflect well in the dark, but which our eyes have trouble seeing. B. is just much more sensitive to visible light than your eyes. C. uses a detector sensitive to X-ray light, so you can see through the dark. D. uses a detector sensitive to infrared light, so you can see objects that are warmer than their surroundings.
Two charged particles, Q1 and Q2, are a distance r apart with Q2= 5Q1. Compare the forces they exert on one another when 
is the force Q2 exerts on Q1 and 
is the force Q1 exerts on Q2.
A.
.B.
.C.
.D.
.E.
.Which of the following best sums up current scientific thinking about the nature of dark matter?
A) Most dark matter probably consists of weakly interacting particles of a type that we have not yet identified. B) Dark matter consists 90% of neutrinos and 10% of WIMPs. C) There is no longer any doubt that dark matter is made mostly of WIMPs. D) Dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.