A diatomic quantum mechanical vibrator in its ground state has energy E. This same vibrator in its third state has energy
A)
E.
B)
3E.
C)
5E.
D)
7E.
E)
9E.
C
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Resistance and Resistivity: A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A. be the same as the original diameter. B. be one-half the original diameter. C. be one-fourth the original diameter. D. be two times the original diameter. E. be four times the original diameter.
An AC voltage source has an amplitude of 96. V and frequency 400. Hz. The voltage was zero at t = 0 and was increasing
(a) What is the effective rms voltage? (b) What is the instantaneous voltage at 1.00 ms? (c) When will the voltage be 40. V?
Earth's magnetic field
a. results from a huge bar magnet within the planet. b. is believed to arise from currents within the planet's core. c. is always parallel to the planet's surface. d. is always in the same direction.
While driving down the highway a lovebug spatters onto your windshield. Which experiences the greater force of impact?
A) the lovebug B) your car C) both the same but with different consequences