In what spectral range are black lights that cause materials to fluoresce in the visible?
A. x-ray
B. infrared
C. ultraviolet
D. radio
E. microwave
C. ultraviolet
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LR Circuits: A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is
A. greater than the battery's terminal voltage. B. equal to the battery's terminal voltage. C. less than the battery's terminal voltage, but not zero. D. zero. E. equal to the voltage across the inductor.
Universal time (UT) is
A) the mean solar time in Greenwich, England. B) another name for standard time. C) the apparent solar time in Greenwich, England. D) a timekeeping system based on careful observations of positions of stars throughout the universe.
Fiber optics depends upon the phenomenon of
A) total internal reflection. B) diffuse reflection. C) polarization. D) dispersion. E) absorption.
A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to heating, how high does it rise after the third bounce, provided we released it 2.3 m from the floor?
A) 110 cm B) 11 cm C) 110 mm D) 140 cm