An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor. At time t = 0 the voltage is zero
At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, where Imax is the current amplitude. What is the unknown element? A) a resistor
B) an inductor
C) a capacitor
D) an inductor or a capacitor
C
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The difference between the pressures inside and outside a tire is called
a. absolute pressure b. gauge pressure c. atmospheric pressure d. psi e. none of the above
Light with ? = 590 nm enters a Michelson interferometer. How many fringes traverse the field of view if the mirror of one arm of the interferometer is moved 0.44 mm?
A) 1066 B) 1812 C) 2004 D) 1776 E) 1492
One of the harmonics of a column of air open at both ends has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?
A) 32 Hz B) 64 Hz C) 88 Hz D) 128 Hz E) 256 Hz
What did Becquerel discover about uranium?
a. That some uranium salts fluoresced in sunlight. b. That all uranium salts fluoresced in sunlight. c. That X rays striking some uranium salts produced visible light. d. That fluorescent light can pass right through the light proof covering used then for photographic plates. e. That all uranium salts would expose photographic film with or without exposure to light.