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
E. 2,233 Hz
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The electrons in a cloud of hydrogen gas are making the transitionfrom excited states tothe ground state. What does the spectrum of this cloud of gas lookalike?
a) It will be completely black at all wavelengths. b) It will be bright at every wavelength, giving off some radio waves, some visible light,and X-rays. c) It will consist of a few bright emission lines at very specific wavelengths. d) It will be bright at most colors, but with some dark absorption linesat very specific wavelengths. e) It will be identical to the spectrum of the Sun.
Polyurethanes result from the reaction of a(n) _________and an isocyanate.
Fill in the blank(s) with the appropriate word(s).
A sound level of 80 dB has twenty times the amplitude of a 60 dB sound
a. True b. False Indicate whether the statement is true or false
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?