A watch dial that continues to glow after a week in the dark is almost certainly
A) fluorescent.
B) phosphorescent.
C) polarized.
D) radioactive.
Correct Answer:
Verified
Q63: Light from a laser is
A)monochromatic.
B)in phase.
C)coherent.
D)all of
Q64: Argon rather than air is the gas
Q65: Which of these lamps has no mercury
Q66: The efficiency of classroom-demonstration lasers is typically
A)about
Q67: The absorption of an infrared photon that
Q69: A laser cannot emit more energy than
Q70: White-light LEDs employ
A)phosphors.
B)white-emitting diodes.
C)extra-high electrical barriers.
D)none of
Q71: The major difference between phosphorescent and fluorescent
Q72: The red laser beam from a helium-neon
Q73: A helium-neon laser beam in a vacuum
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