A sustained flow of electric charge requires
A) a potential difference.
B) a resistance.
C) an electric field.
D) electric polarization.
Answer: A
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A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)
A) 1.5 × 1022 B) 5.1 × 1022 C) 1.8 × 103 D) 8.1 × 103 E) 1.0 × 1023
In a hydrogen atom, an electron with n = 7 can exist in how many different quantum states?
A) 6 B) 7 C) 15 D) 98
Radio telescopes allow us to observe objects that are too cold to emit strongly in the visible part of the spectrum. Astronomers still use images of these object for study. What kind of images are these?
A. black-and-white images B. false-color images C. artist's renditions D. holographic images E. Astronomers do not use images to study radio objects.
A pre-electronic thermostat employs a coiled
A) wire of low conductivity. B) bimetallic strip. C) tube of mercury.