Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum destructive interference is to occur at point P, the two beams must travel paths that differ by
A) a whole number of wavelengths.
B) an odd number of half-wavelengths.
C) a whole number of half-wavelengths.
B
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Ordinary matter in the form stars and planet makes up approximately what proportion of the total mass and energy in the universe?
A) about 70 percent B) a few percent C) about 25 percent D) nearly a 100 percent
The electric company charges a home on the basis of consumption of
a. resistance. b. energy. c. current. d. voltage. e. power.
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3 b. 2.4 c. 2.6 d. 1.8 e. 0.4
The conductivity of a semiconductor sharply increases when 400 nm (or shorter) wavelength light is shone upon it. This is consistent with what energy gap for this material?
A) 3.6 eV B) 0.45 eV C) 2.0 eV D) 3.1 eV E) 1.0 eV