Which is a possible value for the principal quantum number n?
a. 3.14
b. 7
c. 2.5
d. None of these
b
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Parallel-Plate Capacitor: A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)(a) How much excess charge must be on each plate to hold the oil drop steady?(b) Which plate must be positive, the upper one or the lower one?
What will be an ideal response?
Relatively long duration gamma-ray bursts are produced by
A) novae. B) supernovae. C) hypernovae. D) neutron star mergers. E) black hole mergers.
Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures
What will be an ideal response?
Double-Slit Interference: Coherent light of wavelength 540 nm passes through a pair of thin slits that are 3.4 × 10-5 m apart. At what angle away from the centerline does the second bright fringe occur?
A. 1.8° B. 3.7° C. 4.3° D. 1.5° E. 5.0°