Parallel-Plate Capacitor: Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0010 m2, and the separation of the plates is 0.050 mm. An electric field of 7.4 × 106 V/m is present between the plates. What is the capacitance of this capacitor? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 180 pF
B. 120 pF
C. 300 pF
D. 240 pF
E. 360 pF
Answer: A
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Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1. What is the ratio of the capacitance of Sphere #2 to the capacitance of Sphere #1?
A. 1, since all conducting spheres have the same capacitance. B. 2 C. 4 D. 8 E. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.
A beam of light of two different wavelengths enters a pane of glass 3.00 mm thick at an angle of incidence of 56°. The indices of refraction for the two different colors are 1.514 and 1.528
Because of dispersion, the colored beams, although parallel, are separated by a small distance. How far apart are they? A) 0.057 mm B) 0.0083 mm C) 0.025 mm D) 0.014 mm E) 0.0062 mm
Which of the following is a positively charged polyatomic ion?
a. Potassium ion b. Sulfide ion c. Ammonium ion d. Sulfate ion
Choose the correct statement
a. The perceived pitch of a sound usually doesn't depend on the sound's frequency. b. The frequency of each musical note is 10 Hz higher than that of the next lower note. c. The decibel is the standard measure of tone quality. d. The perceived loudness of a sound depends somewhat on frequency.