A star radiates most strongly at 400 nm. What is its surface temperature?
A. 483 K
B. 7,250 K
C. 72,500 K
D. 4,830 K
Answer: B
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A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
A) 6 km/h. B) 8 km/h. C) 10 km/h. D) 20 km/h.
The shorter a wave's wavelength, the greater its energy
Indicate whether the statement is true or false
We see other galaxies moving away from us because:
a) We are at the center of an ancient explosion called the big bang that sent matter hurtling through space in all directions. b) Space itself is expanding so that observers in any galaxy see other galaxies moving away from them. c) Other galaxies are repelled by the black hole at the center of ours.
A conclusion that follows from E=mc2 is that, at the microscopic level,
A) matter is made of force fields. B) tiny indestructible pieces of matter move through empty space. C) there is only matter and antimatter. D) all matter must vibrate at the speed of light. E) matter is made of radiation.