Order the following in order of increasing efficiency of detecting photons of visible light
A) eye, photographic film, CCD
B) photographic film, CCD, eye
C) CCD, eye, photographic film
D) CCD, photographic film, eye
E) eye, CCD, photographic film
A
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How does the hypothesis of inflation explain the near-uniformity of the cosmic microwave background?
A) The expanding universe would have cooled. B) Matter expanded into regions of space that had no matter, and thus ended up at the same temperature. C) Matter was near the critical-density for a universal collapse, which smoothed out the differences in temperatures. D) Prior to rapid inflation, all regions of space were close enough to bounce radiation back and forth and reach the same temperature.
A hockey puck slides off the edge of a table at point A with an initial velocity of 20.0 m/s and experiences no air resistance
The height of the tabletop above the ground is 2.00 m. (a) What is the speed (not the velocity) of the puck just before it touches the ground? (b) What is the distance between point A and the point where the puck hits the ground?
Wire, briar, limber, lock, three geese in a flock. One flew east, one flew west, and one flew over the cuckoo's nest. If they all flew at the same speed and the cuckoo's nest is to the northwest, which graph represents their total momentum?
A. 
B. 
C. 
Given that many of the ideas of quantum mechanics seem so strange to our intuition, why do scientists think these ideas are correct?
A) Quantum ideas can be used to make precise predictions that have been tested and confirmed through observations and experiments. B) Although the ideas seem strange at first, they make perfect sense once they are studied in depth, which is why scientists accept them. C) Quantum ideas were expected to be strange, so the fact that they are strange only lends them support. D) Actually, very few scientists think the quantum ideas are correct, and most expect the theories of quantum mechanics to be completely replaced in the near future.