As atmospheric pressure increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
A) It increases.
B) It decreases.
C) It does not change.
D) It increases on warm days and decreases on cold days.
C
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An object is placed a distance d in front of a plane mirror. The size of the image will be
A) dependent on the distance d. B) half as big as the size of the object. C) twice the size of the object. D) dependent on where you are positioned when you look at the image. E) the same size as the object, independent of the distance d or the position of the observer.