Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity at the observer is a maximum. What is the axis angle settings of polarizer B?
A. 0°
B. 25°
C. 50°
D. 75°
E. 100°
Answer: B
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Solenoid: An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (?0 = 4? × 10-7 T ? m/A)
A. 860 B. 1590 C. 2320 D. 3180 E. 1220
The correct way to connect an ammeter and a voltmeter to make measurements of a circuit element is
A. both should be in parallel with the circuit element B. both should be in series with the circuit element C. an ammeter is always in series with the circuit element and a voltmeter is always in parallel with the circuit element D. an ammeter is always in parallel with the circuit element and a voltmeter is always in series with the circuit element
An observer approaches a stationary 1000 Hz sound source at twice the speed of sound. The observer hears a frequency of
A) 2000 Hz. B) 500 Hz. C) 4000 Hz. D) 1500 Hz. E) 3000 Hz.
A joule per second (J/s) is a
a. Watt. b. Newton. c. Kilogram. d. Second.