For large concerts, loudspeakers are sometimes used to amplifya singer\'s sound.
ID: 1722975 • Letter: F
Question
For large concerts, loudspeakers are sometimes used to amplifya singer's sound. The human brain interprets sounds that arrivewithin 50 ms of the original sound as if they came from the samesource. Thus if the sound from a loudspeaker reaches a listenerfirst, it would sound as if the loudspeaker is the source of thesound. Conversely, if the singer is heard first and the loudspeakeradds to the sound within 50 ms, the sound would seem to come fromthe singer, who would now seem to be singing louder. The secondsituation is desired. Because the signal to the loudspeaker travelsat the speed of light 3×108 m/s, which ismuch faster than the speed of sound, a delay is added to the signalsent to the loudspeaker. ------------------------------------------------------ How much delay must be added if the loudspeaker is 3.0 mbehind the singer and we want its sound to arrive 30 ms after thesinger's? Tdelay=______________ms For large concerts, loudspeakers are sometimes used to amplifya singer's sound. The human brain interprets sounds that arrivewithin 50 ms of the original sound as if they came from the samesource. Thus if the sound from a loudspeaker reaches a listenerfirst, it would sound as if the loudspeaker is the source of thesound. Conversely, if the singer is heard first and the loudspeakeradds to the sound within 50 ms, the sound would seem to come fromthe singer, who would now seem to be singing louder. The secondsituation is desired. Because the signal to the loudspeaker travelsat the speed of light 3×108 m/s, which ismuch faster than the speed of sound, a delay is added to the signalsent to the loudspeaker. ------------------------------------------------------ How much delay must be added if the loudspeaker is 3.0 mbehind the singer and we want its sound to arrive 30 ms after thesinger's? Tdelay=______________msExplanation / Answer
The sound is already delayed by 3 meters or 3/320.4 = 9.4msec. So, we need to add 20.6 msec delay to get to 30msec
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