If light travels 63,000 AU in 1 year at 3 × 10^8 m/s, which of these best represents the unit of a light-year?
a. 63,000 AU b. 3 × 10^8 m/s
c. 1 year d. All of the other choices are correct.
a
RATIONALE: You are seeking a unit of distance as the unit for light-year is distance.
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A new polymer is developed, and to characterize the electrical properties of the polymer, the capacitance is determined to be 20.36×10-13 F in a parallel-plate capacitor that has square plates with a side length of 10-2 m, and the thickness of the polymer sheet and the spacing between the plates is 10-3 m.
(a) What is the dielectric constant or relative permittivity of this new material? (b) If the capacitance measurement is made with an applied voltage of 10 volts, what is the magnitude of the polarization in the new polymer?
Standing Sound Waves: In a resonating pipe that is open at both ends, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at one end and a displacement antinode at the other end. D. None of these choices are correct.
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is
a. 3 minutes. b. 4 minutes. c. 6 minutes. d. 8 minutes. e. 12 minutes.
In an ideal transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?
A) 458 B) 240 C) 110 D) 22