The photoelectric effect is explainable assuming
A) that light has a wave nature.
B) that light has a particle nature.
C) that light has a wave nature and a particle nature.
D) that light is an electromagnetic phenomena.
B
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The extremely hot temperature of the thermosphere has very little significance because
A) the dense air molecules in this region move too quickly to absorb much solar radiation. B) there is very little ozone in the air to absorb the solar radiation. C) there are not enough air molecules and atoms colliding with one another to generate heat energy. D) the thermosphere is very far from Earth's surface.
A wheel is spinning on an axle. The linear velocity of a point on the rim is simply the product of the radius times the rotational velocity, as long as the rotational velocity is measured in units of
A. deg/min. B. rad/s. C. deg/s. D. rev/s. E. rev/min.
A lunar month is about 28 days. If the Moon were farther from Earth than it is now, the lunar month would be
A) more than 28 days. B) less than 28 days. C) about 28 days.
Paleomagnetism from a rock gives information on the
A) direction from the rock to the North Pole. B) present-day magnetic field. C) amount of iron in the rock. D) magnetic field at the time the rock was formed.