Photoelectric Effect: When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following things will also increase?
A. the number of electrons ejected per second
B. the maximum kinetic energy of the ejected electrons
C. the time lag between the onset of the absorption of light and the ejection of electrons
D. the work function of the metal
E. All of these
Answer: A
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Which of the following is not a property of refractory metals?
(a) High melting temperature (b) Good oxidation resistance at high temperature (c) High strength (d) High elastic modulus
While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 3.0 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, down. e. 12.8 m/s, down.
Lakes lying in granite basins, such as those in the northeastern U.S., tend to become acidified by acid rain more readily than lakes lying in limestone basins, such as those found in the midwestern U.S. Why is this so?
A) The granite contains acidic minerals that dissolve in the rain water and are added to the lakes. B) Since the acidified water cannot percolate through the granite, the acid in the lakes becomes more concentrated. C) The limestone, which is calcium carbonate, serves to neutralize the acid in the rain. D) There is more acid rain in the northeast than in the midwestern regions of the U.S.
Elementary Particles: What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?
What will be an ideal response?