An 84-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J ? s)
A) 1.3 ×
B) 2.9 ×
C) 6.3 ×
D) 1.4 ×
A
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What is the average translational kinetic energy per molecule of an ideal gas at a temperature of ? The Boltzmann constant is 1.38 × 10-23 J/K
A) 1.7 × 10-21 J B) 8.3 × 10-21 J C) 6.2 × 10-21 J D) 2.1 × 10-21 J E) 4.1 × 10-21 J
If the current density in a wire or radius R is given by J = kr, 0 < r < R, what is the current in the wire?
A) 2?kR3/3 B) 3?kR3/2 C) kR3/3 D) kR2 E) kR2/2
A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is
A) the same as that of the 1-kg book. B) 5 times as much as for the 1-kg book. C) 10 times as much as for the 1-kg book. D) zero.
A heater is rated at 1200 watts for a 120-volt source.The current in amperes drawn by the heater is
a. 0.1 b. 10. c. 144,000 d. none of the above.