The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light gathering power of a 1.6 m telescope to that of the human eye is ____
a. 2
b. 4
c. 20
d. 400
e. 40,000
E
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What will be an ideal response?
By studying the continuous blackbody spectrum from a solid it is possible to deduce the composition of the solid.
Answer the following statement true (T) or false (F)
Power: A series RLC circuit has a 100-? resistor, 2.0-mH inductor and a 4.0-?F capacitor connected across a 120-V rms ac source at 1000/? Hz. What is the power factor of this circuit?
A. 0.54 B. 0.64 C. 0.74 D. 0.84 E. 0.94
Reactance: A 6.0-?F capacitor is connected to an ac signal with a frequency of 60 Hz. If the maximum voltage applied to the capacitor is 8.0 V, what is its capacitive reactance?
A. 6.0 ? B. 440 ? C. 7.5 × 10-6 ? D. 740 ? E. 160 ?