Why does the Sun's image look distorted in shape at sunset?
A) The distortion arises because of the way air affects the paths of light.
B) The distortion is an illusion that you notice by eye but does not show up in photographs.
C) Air scatters different colors of light by different amounts.
D) The distortion is an artifact of the photographic process that your eyes would not actually see.
A) The distortion arises because of the way air affects the paths of light.
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The ground-state energy of an electron in a hydrogen atom is ?13.6 eV. This means that the binding energy of that electron is
A. ?13.6 eV. B. +13.6 eV. C. Some other value (specify).
Neutral hydrogen is most obvious in the electromagnetic spectrum:
A) in yellow light of the Sun's continuum. B) at 656.3 nm, hydrogen alpha red. C) at 21 cm in the radio region. D) at 121.3 nm, the Lyman alpha ultraviolet line. E) Neutral hydrogen has yet to be detected in space.
Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom?
a. The block that went straight down. b. The block that went down the ramp. c. They both will have the same speed. d. Insufficient information to work the problem.
The New Horizons space probe passed through the Pluto system in
A) 2008. B) 2012. C) 2015. D) 2016.