Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers
When the person moves 3.00 m parallel to the wall, she experiences destructive interference for the second time. What is the frequency of the sound? The speed of sound in the room is 343 m/s. CAREFUL! The distance to the wall is NOT much greater than the distance between the speakers.
A) 278 Hz
B) 422 Hz
C) 452 Hz
D) 562 Hz
E) 694 Hz
Answer: A
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Once a protoplanet reached a large mass, what is the next step for it to formally grow into a planet?
a. gravitational collapse b. expanding c. accretion d. condensation e. slowing momentum
Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth's atmospheric "seeing". Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they
a. have high radial velocities. b. are very luminous. c. are surrounded by quasar fuzz. d. radiate huge amounts of energy. e. fluctuate rapidly on time scales as short as a few hours.
Inductive reactance XL is given by
A.
B.
C.
.D.
E.
An uncharged 30.0-µF capacitor is connected in series with a 25.0-? resistor, a DC battery, and an open switch. The battery has an internal resistance of 10.0 ? and the open-circuit voltage across its terminals is 50.0 V
The leads have no appreciable resistance. At time t = 0, the switch is suddenly closed. (a) What is the maximum current through the 25.0-? resistor and when does it occur (immediately after closing the switch or after the switch has been closed for a long time)? (b) What is the maximum charge that the capacitor receives? (c) When the current in the circuit is 0.850 A, how much charge is on the plates of the capacitor?