A stable electron orbit cannot exist if its circumference is
A) a single wavelength.
B) 2 wavelengths.
C) 2.5 wavelengths.
D) any of the above
E) none of the above
Answer: C
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Free _________grades of copper have 1 to 6 weight percent lead.
Fill in the blank(s) with the appropriate word(s).
The short pulses and the discovery of the pulsar in the Crab Nebula are strong evidence that pulsars are _____
A) red dwarfs B) neutron stars C) giant stars D) yellow dwarfs
Power: If the units of your answer are kg ? m2/s3, which of the following types of quantities could your answer be? (There could be more than one correct choice.)
A. kinetic energy B. potential energy C. force D. power E. work
Consider two planets in space that gravitationally attract each other. If the mass of one planet is doubled, and the distance between them doesn't change, then the force between them is
A) one-quarter. B) half as much. C) twice as much. D) four times as much. E) none of the above