1.) The unit of sound intensity level is the a.) Hz b.) W c.) dB d.) W/m^2 e.) l
ID: 2237336 • Letter: 1
Question
1.) The unit of sound intensity level is the a.) Hz b.) W c.) dB d.) W/m^2 e.) lb 2.) As you are standing on the sidewalk, a loudspeaker on the roof of a car driving away from you vibrates 440 times per second. The number of compressions per second entering your ears is a.) greater than 440 b.) 440 c.) less than 440 d.) 344 m/s 3.) In a 440 Hz sound wave the pressure in the compressions and rarefactions is about 1% higher and lower, respectively, than the pressure in the absence of sound. The sound is a.) too soft to be heard b.) about as loud as normal conversation c.) deafeningly loud 4.) When the power output of an amplifier is 2W, the SIL at a certain distance from a loudspeaker it is driving is 100 dB. When the power is turned up to 20W, the SIL changes to a.) 92 dB b.) 110 dB c.) 118 dB d.) 200 dB e.) 1000 dBExplanation / Answer
1) c) dB
2) moving away so frequency is decresed so less than 440 c)
3) c) deafingly loud
4) goes up by the 10*log(10) = 10 dB so b)
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