The electron drift speed 
A. 
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Far infrared astronomy must be done from high-flying aircraft because
a. far infrared radiation is absorbed low in Earth's atmosphere. b. far infrared photons are quite energetic. c. far infrared telescopes are not very heavy. d. far infrared sources are very bright. e. None of the other choices are correct.
For which of these scenarios is the particle model of light more convenient to use?
A. the Doppler shift of light B. refraction of light through a lens C. reflection of light from a mirror D. diffraction of light through a slit E. None of these choices are correct.
If, from the point of view of Earth-bound observers, the Moon is in new Moon phase on a particular day, what phase is Earth as seen from the Moon?
What will be an ideal response?
A spinning cloud of interstellar gas tends to
A) disperse. B) flatten. C) turn into a sphere. D) condense.