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 ?
Answer: B
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A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 6.8 × 1014 Hz B) 2.7 × 1014 Hz C) 7.6 × 1014 Hz D) 8.5 × 1014 Hz E) 9.4 × 1014 Hz
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