Why are there no impact craters on the surface of Io?
A) Io is too small to have experienced many impacts.
B) Jupiter's strong gravity prevents impacts from hitting Io.
C) All of Io's impact craters have been buried by lava flows.
D) Any impact craters that once existed on Io were eroded by winds and rain.
E) Io formed only recently, long after the heavy bombardment ended.
C) All of Io's impact craters have been buried by lava flows.
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The classical model of the hydrogen atom that explains its spectral line structure is due to:
A) Kirchhoff. B) Bohr. C) Fraunhofer. D) Newton. E) Mendeleev.
In a circuit powered by a battery, charge
A) flows through the battery. B) is energized by the battery. C) both of these D) neither of these
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a. 2100 J b. 2400 J c. 2100 W d. 2400 W e. 262.5 W