The continual stream of charged particles
projected outward from the Sun's surface into
space are referred to as the
a) solar wind.
b) sunspot cycle.
c) chromosphere.
d) umbra.
a
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Harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that
A) she has changed frames of reference. B) he has changed frames of reference. C) both have changed frames of reference. D) neither has changed frames of reference
Which of these was NOT a difficulty initially met in explaining the photoelectric effect?
a. The transferred kinetic energy seemed to work too quickly. b. If light is a wave, its amplitude should have governed the energy imparted to electrons to cause their emission, and frequency should have had the effects it had. c. Increased intensity of the light did not increase the maximum kinetic energy of emitted electrons. d. Increased frequency of the light increased the maximum kinetic energy of the electrons. e. Electrons could not escape from solid materials.
Suppose we represent Earth with a basketball. On this scale, most of the air in Earth's atmosphere would fit in a layer that is
A) about the thickness of a sheet of paper. B) about an inch thick. C) about 6 inches thick. D) about a half-inch thick.