PET is an abbreviation for
A)
photon-electron tunneling.
B)
positron emission tomography.
C)
photon emission tunneling.
D)
photon emission tomography.
E)
pericranial electromagnetic technique.
B
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A typical "shooting star" during a meteor shower is caused by a ________ entering Earth's atmosphere.
A) boulder-size particle from an asteroid B) boulder-size particle from a comet C) pebble-size particle from an asteroid D) pebble-size particle from a comet E) microscopic particle of interstellar dust
The most basic difference between elliptical galaxies and spiral galaxies is that ________
A) elliptical galaxies are very old and spiral galaxies are very young B) elliptical galaxies lack anything resembling the disk of a spiral galaxy C) elliptical galaxies have a spheroidal component (of stars distributed spherically about the galactic center), and spiral galaxies do not D) elliptical galaxies lack anything resembling the halo of a spiral galaxy
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 3 sin (2x) cos 5t where x is in m and t is in s. What is the wavelength of the interfering waves?
a. 3.14 m b. 1.00 m c. 6.28 m d. 12.0 m e. 2.00 m
A 1-kg rock is suspended from the tip of a horizontal meterstick at the 0-cm mark so that the meterstick barely balances like a seesaw when its fulcrum is at the 25-cm mark. From this information, the mass of the meterstick is
A) 1/4 kg. B) 1/2 kg. C) 3/4 kg. D) 1 kg. E) none of the above