The most abundant component of the atmospheres of Uranus and Neptune is
A) hydrogen.
B) helium.
C) methane.
D) ammonia.
E) nitrogen.
A
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In vacuum, the components of an EM wave are 
and 
0. What 
?
a. 
b. 
c. 
d. 
e. More information is needed.
Pressure in a Liquid: If atmospheric pressure increases by an amount ?p, which of the following statements about the pressure in a lake is true? (There could be more than one correct choice.)
A. The absolute (total) pressure does not change. B. The absolute (total) pressure increases, but by an amount less than ?p. C. The absolute (total) pressure increases by ?p. D. The gauge pressure increases by ?p. E. The gauge pressure does not change.
A fast-moving body must have a larger acceleration than a slow-moving body
a. True b. False Indicate whether the statement is true or false
Refraction is
A. The 'bouncing' of light off a surface B. The disappearance of light in a medium C. The bouncing of light off impurities in the medium D. The change of direction of light as it moves from one medium into another