The brightness of a lamp is directly related to its
A) brand.
B) place of manufacture.
C) power rating.
D) all of the above
E) none of the above
Answer: C
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______ is a spacing technique that allows designers to squeeze or stretch text to fit in a specific amount of space.
A. Leading B. Tracking C. Kerning D. Indenting
The wavelength of light visible to the human eye is on the order of 5 × 10^?7 m. If the speed of light in air is 3 × 10^8 m/s, find the frequency of the lightwave
a. 3 × 10^7 Hz b. 4 × 10^9 Hz c. 5 × 10^11 Hz d. 6 × 10^14 Hz e. 4 × 10^15 Hz
According to general relativity, a black hole is
A) an object that cannot be seen. B) a hole in the observable universe. C) a place where light travels slower than the normal speed of light. D) a place where light travels faster than the normal speed of light. E) a place where there is no gravity.
The intensity of unpolarized light passing through a single sheet of polarizing material changes by a factor of:
a. 0.5. c. cos2 q. b. 1. d. cos q.