41. In the atomic lattice the ________ and ________ form the nucleus.
(a) electrons, neutrons
(b) electrons, protons
(c) neutrons, protons
(d) None of the above
42. An increase in temperature of a semiconductor can result in a ________ in the number of free electrons in the material.
(a) substantial increase
(b) substantial decrease
(c) slight decrease
(d) no change
43. What is the maximum power rating for LEDs?
(a) 150 mW
(b) 500 mW
(c) 1 W
(d) 10 W
44. In which of the following is the light intensity measured?
(a) Candela
(b) Efficacy
(c) Flux
(d) Illumination
45. What is the range of the operating voltage level for LEDs?
(a) 5–12 mV
(b) 1.7–3.3 V
(c) 5–12 V
(d) 20–25 V
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