A 2000 N car travels 50 m along a level road, powered by a drive force of 1000 N. The work done by the drive force is
A) 50,000 J. B) 10,000 J. C) zero. D) 1000 J. E) 2000 J.
A
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Answer the following statement true (T) or false (F)
The source of all electromagnetic waves is
A) changes in atomic energy levels. B) vibrating atoms and molecules. C) accelerating electric charges. D) crystalline fluctuations. E) none of the above
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), we expect the term fciv to be small if
A) most civilizations destroy themselves within just a few hundred years of arising. B) most of the civilizations that have ever existed are still out and about in the galaxy. C) primitive life is common but intelligent life is rare. D) most habitable planets never actually get life on them.
For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 320 nm B) 340 nm C) 330 nm D) 350 nm