In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given point every minute. Late at night, the traffic flow is only 8 cars per minute. What is the late-night decibel level?
a. 77 dB
c. 70 dB
b. 74 dB
d. 69 dB
D
Physics & Space Science
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Magnification by a lens would be greater if light
A) propagated instantaneously. B) traveled faster in glass than it does. C) traveled slower in glass than it does. D) beams spread less. E) none of the above
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The charge flowing through a light bulb attached to a 12.0-V battery in 11.0 s is 30.0 C. What is the total energy delivered to the filament during this process?
a. 12.0 J b. 360 J c. 3 960 J d. 132 J e. 690 J
Physics & Space Science
Infiltration can be reduced primarily by ________
a. insulation b. double pane windows c. weatherstripping d. lowering the thermostat e. furnace maintenance
Physics & Space Science