If you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces
A) thermal radiation.
B) radio waves.
C) an absorption line spectrum.
D) an emission line spectrum.
E) X-rays.
D
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If the electromagnetic force is stronger than gravity, then why is it overpowered by gravity on large scales?
A) The electromagnetic force only works on scales of about the size of an atomic nucleus. B) The electromagnetic force follows an inverse cube law with distance, rather than an inverse square law. C) Electrical charge is canceled out by mass. D) Most objects are electrically neutral.
New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors b. using computer image processing to enhance images c. building mirrors in hexagonal segments d. continually adjusting the mirror's shape during observations
What type of faulting is expected along transform faults?
a. Reverse b. Forward c. Strike-slip d. Normal
The average density of Earth is ________.
A. about 1 g/cm3 B. about 1 cm3/g C. about 5.5 g/cm3 D. about 5.5 cm3/g