An LRC circuit with R = 15 ?, L = 25 mH, and C = 30 ?F, is attached to a 100 V ac (rms) power supply at the resonant frequency
(a) What is the current (rms) in the circuit?
(b) What is the power dissipated by the circuit?
(a) 6.7 A
(b) 670 W
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Semiconductors: The energy gap between the valence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 599 nm B. 959 nm C. 873 nm D. 994 nm
When a fixed amount of ideal gas goes through an isochoric process
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must increase. E) its pressure must increase.
A converging lens always forms an object's image at the focal point of the lens
a. True b. False Indicate whether the statement is true or false
Sarah traveled by automobile from Ft
Lauderdale to Naples, Florida, a distance of 120 miles, at an average speed of 60 mi/h. The time required was a) 5000 hours. b) 2.0 hours. c) 0.50 hours. d) 2.5 hours.