CFCs are
a. alcohols.
b. hydrocarbons.
c. alkyl halides.
d. amides.
c
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Which type of electromagnetic wave is the shortest?
a. radio b. X-rays c. visible light d. gamma e. microwave
Quasars are most common with redshifts
a. less than 0.1 b. less than 0.5 c. of about 2 d. greater than 6 e. greater than 8
The Bohr theory does not predict that
a. hydrogen atoms will give off the lines from the Balmer series. b. the ground state of hydrogen is spherically symmetric. c. it requires 13.6 eV to ionize hydrogen. d. the approximate radius of a hydrogen atom is 5.3 × 10^?11 m.
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 N s. b. 6.1 × 10^4 N s. c. 8.0 × 10^4 N s. d. 5.0 × 10^5 N s. e. 6.0 × 10^5 N s.