Which one of the following in not one of the drawbacks to the use of coal, i.e., which of the following is false?
A) We will run short on coal resources before long.
B) Coal mining causes destruction of the land.
C) Coal burning causes pollution.
D) Coal burning contributes to the greenhouse effect thus heating Earth.
E) Coal mining causes a large number of miner's deaths due to miner's diseases.
A
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Potential of Point-Charges: Two point charges of +2.00 ?C and +4.00 ?C are at the origin and at the point x = 0.000 m, y = -0.300 m, as shown in the figure. What is the electric potential due to these charges, relative to infinity, at the point P at x = 0.400 m on the x-axis? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. 117 kV B. 15.7 kV C. 11.7 kV D. 56.0 kV E. 36.0 kV
Thin Films: Light has wavelength 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? (c = 3.0 × 108 m/s)
A. 3.3 × 1014 Hz B. 5.0 × 1014 Hz C. 3.3 × 105 Hz D. 5.0 × 105 Hz
In order for a color to be visible in thin film interference, the wavelength of that color must
A. Satisfy the destructive interference conditions B. Satisfy the constructive interference conditions C. Be smaller than the thickness of the film D. Be larger than the thickness of the film
Huygen's principle states that
1.there is a secondary rainbow with the spectral colors reversed from the primary rainbow. 2.light has properties of both waves and particles. 3.all points on a wave front can be taken as point sources of secondary spherical wavelets which construct the new position of the wave front as time passes. 4.rainbows are a result of dispersion.