Every second at Niagara Falls, some 5000 m3 of water falls a distance of 50 m. What is the increase in entropy per second due to the falling water? (Assume a 20°C environment)
8360 kJ/K
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Which of the following wavelengths could NOT be present as a standing wave in a 2 m long organ pipe open at both ends?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m
A surface is coated with a material having index of refraction 1.50 . If light in air has a wavelength of 450 nm and is normally incident on this surface, and it is found through interference effects with this light that the surface is 15 wavelengths thick, which of the following is the thickness of the surface?
a. 6.8 mm c. 3.0 mm b. 1.5 mm d. 4.5 mm
Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that signify active star formation. B) They are moving slower than stars in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black.
In a photoelectric effect experiment, the frequency of photons bombarding the surface is increased until photoelectrons just start to leave the surface. If this occurs at a frequency of 
what is the work function of the surface?
A. 1.0 eV B. 1.5 eV C. 2.0 eV D. 2.5 eV E. 3.0 eV