If the primary coil of a transformer contains more loops than the secondary coil then it is a
A) step-up transformer. B) step-down transformer.
B
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A 104-? resistor is connected in series with a 14.7-µF capacitor and a 56-Hz, 136-V (rms) line voltage. If electrical energy costs 4.8¢ per kWh, about how much does it cost to leave this circuit connected for 24 hours?
a. 2¢ b. 46¢ c. 200¢ d. 5¢
What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 417 nm B) 257 nm C) 344 nm D) 565 nm E) 610 nm
What is the most likely reason that there are no giant planets beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance. B) There was no material to create planetesimals beyond the orbit of Neptune. C) By the time planetesimals grew to a large enough mass to hold onto an atmosphere, the solar nebula had been blown away. D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters. E) There may be, but they would be so faint that astronomers have not found them yet.
A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron: m = 3.3 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 19 mm b. 13 mm c. 20 mm d. 10 mm e. 9.0 mm