If total internal reflection occurs at a glass-air surface:
a. no light is reflected. b. no light is refracted. c. light is leaving the air and hitting the glass with an incident angle less than the critical angle.
d. light is leaving the air and hitting the glass with an incident angle greater than the critical angle.
B
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As a balloon high in the atmosphere descends, it undergoes a decrease in
A) volume. B) density. C) weight. D) mass. E) none of the above
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Which has the larger kinetic energy, a 50-kg person running at a speed of 2 m/s, or a 5-g nickel falling at a speed of 200 m/s?
A. The running person B. The falling nickel C. Both have about the same kinetic energy.
A bar magnet passes through a circular loop of wire as shown below. At the instant that the middle of the magnet passes through the loop, the induced current ( as seen from the coil # 2) is
A. ccw and increasing.
B. cw and decreasing.
C. cw and increasing.
D. zero.
