Which of the following devices represent(s) a practical application of the photoelectric effect?
a. hologram
b. photocell
c. both of the above choices
d. none of the above choices
b
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What will be an ideal response?
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A. A B. B C. C D. D E. E
An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s away from the stationary ambulance, then what is the frequency of the siren perceived by the observer?
A. 2,375 Hz B. 2,366 Hz C. 2,305 Hz D. 2,275 Hz E. 2,233 Hz
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A) gas. B) plasma. C) liquid. D) solid. E) a mixture of all of the above