Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction of
A) the slower car.
B) the faster car.
C) neither, for they stop.
Answer: B
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a. a perfect emitter and a perfect absorber of light b. a perfectly opaque object c. a dense object having a temperature above absolute zero d. All of the other choices are correct.
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A) Each body has different atmospheric content and a different density. B) Each body has different surface features and different atmospheric content. C) Each body has different chemical composition and different surface features. D) Each body has a different density and a different chemical composition. E) Each body has a different chemical composition and different atmospheric content.
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What is the wavelength associated with the electron in the n = 6 state of hydrogen?
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