A golfer hits a ball on a level fairway at an angle of 60° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at another angle, and it lands on the green by the other ball. What was the launch angle for the second golfer?
a. 30°
b. 20°
c. 45°
d. 40°
e. 10°
a
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Most atoms are
a. electrically charged. b. uncharged but made up of electrically charged pieces. c. unitary things that cannot be broken up in any way. d. sources of easily-removed protons. e. sources of easily-removed neutrons.
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.4) that is 500-nm thick. Calculate the change of phase of the light that penetrates the front surface, reflects from the second surface, and emerges through the first surface as an angle between 0° and 360°?
A. 280° B. 160° C. 220° D. 100° E. 290°
The longest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3, is closest to which one of the following values? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 625 nm B) 600 nm C) 550 nm D) 658 nm E) 575 nm
At what temperature would the rms speed of H2 molecules equal the earth's escape speed (11,200 m/s)?
A. 
K
B. 
K
C. 
K
D. 
K