The only metal that does not react with oxygen under ambient conditions is _________.
Fill in the blank(s) with the appropriate word(s).
gold
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Quasar spectra often show the same hydrogen absorption line with several different redshifts. What do these lines represent?
A) clouds of gas at different distances between us and the quasar B) different elements in the accretion disk around the quasar C) different elements in the Earth's atmosphere D) a single cloud of gas with clumps moving at different speeds E) hydrogen gas orbiting the quasar's central black hole at high speed
A pendulum swings through 10 cycles in 2 seconds. The frequency of the pendulum is
A. 5 Hz. B. 10 Hz. C. 0.1 Hz. D. 0.5 Hz. E. 2 Hz.
Most of the mass of the Galaxy lies in the ________
Fill in the blank(s) with correct word
You can raise the temperature of an object with
a. microwaves. b. infrared waves. c. ultraviolet rays. d. all of the above. e. only (a) and (b) above.