The evening sunsets are reddish orange because the atmosphere
A. absorbs blue light.
B. is more efficient at scattering blue light.
C. contains small amounts of red dust that give the air its red color.
D. absorbs the red light.
E. is most efficient at scattering red light.
Answer: B
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Using the following unit conversions: 1.00 fluid ounce = 29.573 ml, 1.00 L = 1000 
density of water = 
the number of fluid ounces in a kg of water is
A. 48.8 fluid ounces. B. 40.1 fluid ounces. C. 33.8 fluid ounces. D. 25.7 fluid ounces.
What is the Q of the reaction 
The rest mass of the proton is 938 MeV/c2 and of the neutral point is 135 MeV/c2
A. 187 MeV B. 135 MeV C. 938 MeV D. -187 MeV E. -135 MeV
A distance R away from a light source we observe which of the following for the electromagnetic field it produces?
A) Both the light intensity and the magnitude of the electric field drop as 1/R2. B) The light intensity drops as 1/R2, but the magnitude of the electric field drops as 1/R. C) Both the light intensity and the magnitude of the electric field drop as 1/R. D) The light intensity drops as 1/R, but the magnitude of the electric field drops as 1/R2. E) None of the previous answers is correct.
A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 590 nm. Monochromatic light of a different wavelength is now shown on the tube, and the stopping potential is measured to be 2.30 V
What is the wavelength of this new light? (c = 3.00 × 108 m/s, e = - 1.60 × 10-19 C, h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J) A) 320 nm B) 300 nm C) 340 nm D) 360 nm E) 410 nm