Water is an example of a(n):
a. atom
b. ion
c. compound
d. mixture
e. element
c
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What must you do to get away from the harmful effects of radioactivity?
A) live at the North or South Poles. B) go deep beneath Earth's surface. C) go to the Moon. D) die.
When salt is introduced to ice, the temperature at which melting occurs is
A) quite unaffected. B) lowered. C) increased. D) dependent on the shape of salt and ice crystals
Why is hydrogen used as the target for proton collisions?
a. Because of its low cost and great abundance. b. Because having only one electron in the way makes hydrogen's protons more accessible for collisions. c. Because there are so many neutrons in the hydrogen nucleus. d. Because hydrogen is the closest attainable thing to a target of pure protons. e. Because hydrogen contains no protons.
If a = 1.0 cm, b = 3.0 cm, and I = 30 A, what is the magnitude of the magnetic field at point P?
A. 0.62 mT B. 0.59 mT C. 0.35 mT D. 0.31 mT E. 0.10 mT