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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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.
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