An excited hydrogen atom is capable of emitting radiation of
A) a single frequency.
B) three frequencies.
C) many more than three frequencies.
Answer: C
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In part (a) of this figure, three identical, equally spaced objects are dropped. In part (b), the two green blocks are moved closer together before they are dropped. In part (c), the two green blocks are combined to form one larger block. Contrasting Galileo's and Aristotle's views, what is the most plausible statement about the speed of the large green block compared with that of the small red
block? a. The green block must fall faster because it is more massive. b. The green block can be seen as two side-by-side smaller blocks falling at the same rate, hence the larger and smaller blocks fall at the same rate. c. The larger and smaller blocks fall at the same rate only in a vacuum. d. The larger block speeds up the fall of the lighter block, but only if they are tied together. e. The lighter block slows the fall of the heavier block, but only if they are tied together.
If ice were denser than water, during winter lakes and ponds would
A) completely freeze B) remain liquid C) freeze on the surface but remain liquid beneath D) freeze on the bottom but remain liquid at the surface
The size of the electric current in an electrical conductor is a function of which of the following?
a. velocity of charge carriers b. conductor cross-sectional area c. density of charge carriers d. All of the above choices are valid.
A skydiver of 75 kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?
a. 15 m/s b. 49 m/s c. 30 m/s d. 42 m/s e. 36 m/s