Could acupuncture be responsible for the patients' recovery?
A) No. If there is no plausible mechanism of action, then clearly acupuncture cannot be responsible for their healing.
B) Yes. Just because we don't understand the mechanism doesn't mean the process does not occur.
C) No. Acupuncture is not accepted by most medical doctors, therefore it isn't effective.
D) Yes. If the patients got better, then the acupuncture must be effective.
B
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The presence of elements heavier than helium in stars is very important because
A) they provide the raw materials for the formation of planets and life B) without them they could not form C) they help stabilize their interiors D) they are responsible for the fusion reactions at their centers
Infrared solar radiation can be harmful to plants
What will be an ideal response?
For bright stars to form, the protostars must condense in dense, dark nebulae
Indicate whether the statement is true or false
In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why? 
A. The cathode eventually stops emitting electrons. B. The kinetic energy of ejected electrons starts out small but quickly reaches a maximum value. C. The charge difference between the cathode and anode is initially small but with time becomes so large that no electron from the cathode can make it to the anode. D. The cathode eventually runs out of electrons to emit. E. Some other explanation (describe).