Which of the following statements best describes the relation between quantum theory and the photoelectric effect experiment?
a. The photoelectric effect contradicts quantum theory.
b. Quantum theory explains the photoelectric effect.
c. Quantum theory has no bearing on the photoelectric effect.
d. The photoelectric effect explains quantum theory.
B
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What is the maximum value of the electric field E at 1.5 m from a 102-W light bulb radiating in all directions? (µ0 = 4? × 10^?7 T?m/A, c = 3.00 × 10^8 m/s)
a. 5.2E+1 V/m b. 4.1E+3 V/m c. 2.7E+3 V/m d. 8.5E+2 V/m e. 3.2E+2 V/m
A solar heating system has a 25.0% conversion efficiency; the solar radiation incident on the panels is 800 W/m2 . What is the increase in temperature of 25.0 kg of water in a 1.00-h period by a 3.40-m2-area collector? (cw = 4 186 J/kg/°C)
a. 93.6°C b. 6.88°C c. 23.4°C d. 46.8°C e. 17.5°C
A piece of plastic has a net charge of +2.00 ?C. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)
A) 1.25 × 1013 B) 1.25 × 1019 C) 2.50 × 1013 D) 2.50 × 1019
Metamorphic foliation is
A) the same as sedimentary layering. B) the prominent orientation of recrystallized minerals. C) caused by the interaction with chemical fluids. D) a layered appearance caused by mineral growth perpendicular to direction of pressure.