Doppler Effect: Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 536 Hz. A microphone is moved between the speakers along the line joining the two speakers with a constant speed of 1.60 m/s. What beat frequency is observed? The speed of sound in air is 343 m/s.
A. 5.00 Hz
B. 6.00 Hz
C. 7.00 Hz
D. 8.00 Hz
E. 9.00 Hz
Answer: A
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A conductor is distinguished from an insulator with the same number of atoms by the number of:
A) nearly free atoms B) electrons C) nearly free electrons D) protons E) molecules
If a positively charged object is brought near a suspended, negatively charged object, the suspended object will be
a. repelled. b. charged more. c. discharged. d. attracted.
A current reading is obtained by properly placing an ammeter in a circuit consisting of one resistor and one battery. As a result,
A) the voltage drop across the resistor increases. B) the current flowing in the circuit increases. C) the current flowing in the circuit decreases. D) the current flowing in the circuit does not change.
What is the momentum of an electron moving at a speed of 0.90 c?
A. 
B. 
C. 
D. 
E. 