Which light-emitting process is characterized by an afterglow?
A) incandescence.
B) fluorescence.
C) phosphorescence.
D) resonance.
E) none of the above
Correct Answer:
Verified
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
Q74: Compared to the energy put into a
Q75: Which light source is more energy-efficient?
A)a fluorescent
Q76: The lamp most similar to the common
Q78: Atoms can be excited by
A)thermal agitation.
B)electron impact.
C)photon
Q79: Some light switches that glow in the
Q80: A paint pigment that absorbs blue light
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