What is the uncorrected near point of a farsighted person who can comfortably read a newspaper held 25 cm from his eyes when he wears +3.33-diopter contact lenses?
A) 1.5 m
B) 0.50 m
C) 1.9 m
D) 0.75 m
E) 0.60 m
A
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Indicate whether the statement is true or false
The major difference between phosphorescent and fluorescent materials is
A) a time delay between excitation and de-excitation. B) a difference in brightness. C) the greenish color of phosphorescence. D) none of the above
Two masses m1 and m2, with m1 = 3 m2, undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision?
a. 3 v b. v/3 c. 3v/4 d. v
An object that is giving off only infrared electromagnetic waves is giving off heat through:
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