Our earliest atmosphere, formed by outgassing, was much poorer in ________ than now
A) carbon dioxide
B) hydrogen
C) oxygen
D) methane
E) nitrogen
C
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One year
a) has more sidereal days than solar days. b) has more solar days than sidereal days. c) always has exactly 365 sidereal days. d) is based entirely on Earth's rotation rate.
A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is then
A) 300 N downward. B) 500 N downward. C) 800 N downward. D) 300 N upward. E) 500 N upward.
If the work function of a metal surface is 2.20 eV, what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
(1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 2.05 × 1014 Hz B) 1.02 × 1014 Hz C) 2.50 × 1014 Hz D) 3.53 × 1014 Hz E) 5.92 × 1014 Hz
Humans’ specific day-night rhythms
A. Circadian Rhythm
B. Glare
C. Vincent Van Gogh
D. International Dark-Sky Association
E. Shielding
F. Sky Glow