Radio waves, of sufficient frequency, pass through which of the following ion layers?
a. C
b. D
c. E
d. F
b
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Compared to the density of a kilogram of feathers, the density of a kilogram of lead is
A) less. B) greater. C) the same.
A light bulb designed for use with AC would still work if hooked up to DC of the proper voltage
a. True b. False Indicate whether the statement is true or false
Igneous rock that formed below Earth's surface by solidification of magma is known as
a. extrusive rock. b. intrusive rock. c. metamorphic rock. d. silicate rock.
A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. What is the charge on the inner surface of the shell now?
1.Q 2.Q/2 3.0 4.-Q/2 5.-Q