According to the laws of thermal radiation, hotter objects emit photons with
A) a lower average frequency.
B) a shorter average wavelength.
C) a lower average energy.
D) a higher average speed.
B
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Suppose we had a device that allowed us to see Earth's interior. If we looked at a typical region of the mantle, what would we see happening?
A) not much—on human time scales, the mantle looks like solid rock B) hot molten rock rising upward throughout the mantle and cool, solid rock falling downward C) a rapid, up-and-down churning of the material in the mantle D) dense metals falling downward while low-density rock rises upward
Something falling into a black hole will be ________ by tides
Fill in the blank(s) with correct word
A star is observed with a surface temperature of 3,000 K and a luminosity of 10?2 solar. What is the approximate mass of this star?
A) 0.5 Msun B) 0.9 Msun C) 0.2 Msun D) The mass cannot be determined.
Electromagnetic radiation with a wavelength of 700 nm would be:
A) X-rays. B) red light. C) violet light. D) ultraviolet light. E) microwaves.