What is the focal length of a pair of contact lenses that will allow a person with a near point of 125.0 cm to read a newspaper held 25.0 cm from his eyes?
A) -100 cm
B) -31.3 cm
C) 10.2 cm
D) 20.8 cm
E) 31.3 cm
E
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The neutron decays into a proton, electron, and an electron antineutrino. Into what does the antineutron decay?
A. a proton, positron, and electron antineutrino B. an antiproton, positron, and electron neutrino C. a proton, electron, and electron antineutrino D. an antiproton, electron, and electron neutrino E. an antiproton, electron, and electron antineutrino
Spectral lines for an element are often in the
A) infrared region. B) ultraviolet region. C) both of these D) neither of these
Series/Parallel Circuits: A 22-A current flows into a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What current flows through the 12-? resistor?
A. 18 A B. 11 A C. 7.3 A D. 3.7 A
A device that transforms mechanical energy to electrical energy is a
A) generator. B) motor. C) transformer. D) magnet. E) none of the above