What is the time constant of the circuit shown in Figure OQ28.7? Each of the five resistors has resistance R, and each of the five capacitors has capacitance C. The internal resistance of the battery is negligible
4
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Resonance occurs with forced vibration that requires the
A) least amount of energy input. B) maximum amount of energy input. C) matching of wave amplitudes. D) matching of constructive and destructive interference. E) minimum beat frequency.
The greenhouse effect is occurring because
a. the ozone layer is being depleted. b. the amount of carbon dioxide in the atmosphere is increasing. c. the ionosphere reflects low frequency radiation. d. more ultraviolet radiation is penetrating the atmosphere. e. none of the above.
Fresnel lenses are
a. made of mirror segments b. made of the surface portions of a regular lens c. found in some auto headlamps and theater lights and rear windows of RVs d. all of the above
A machinist with normal vision has a near point at 25 cm. The machinist wears eyeglasses in order to do close work. The power of the lenses is +4.25 diopters. With these eyeglasses, the near point of the machinist, in cm, is closest to:
A) 12 B) 10 C) 7 D) 15 E) 17