QUESTION 1In a private office, the fire alarm sound level should be a minimum ofdB, anddB above ambient.In a residential bedroom, the fire alarm sound level should be a minimum ofdB.QUESTION 2A 25 m x 25 m room has four wall mounted strobe lights. What is the light output intensity of each strobe?QUESTION 3An advantage of a speaker over a bell is that the speaker output sound level is adjustable.O TrueO FalseQUESTION 4For visual devices installed in a corridor, the maximum distance from the device to the end wall isand the maximum distance between devices isQUESTION 5DC voltage driven devices such as bells and horns have ainside. The purpose of this, is tosupervisory current.

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Answered: QUESTION 1 In a private office, the…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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You and your roommate decide to throw a party. You rig up three speakers with a combined decibel level of 83.5 db. You know that speaker one is 78.0 dB and speaker 2 is 76.0 dB. The sticker on the back of speaker 3 is missing, so you will have to calculate how many decibels it is. How many decibels is the third speaker?
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The softest sound a human ear can hear is at 0 dB (Io = 10-12 W/m2). Sounds above 130 dB cause pain. A particular student's eardrum has an area of A = 51 mm^2. a. What is the most power, in watts, the ear can receive before the listener feels pain? b. What is the smallest power, in watts, the ear can detect?
The electrical power needed to operate a speaker in your audio system is 18.7 W. If this speaker has a circular opening with a radius of 0.0743 m and the average sound intensity at the opening is 22.1 W/m2, determine the ratio of sound output power Psound to electrical input power Pelectrical. Psound Pelectrical
A good hearing aid will uniformly increase the sound intensity of all audible frequencies of sound by 34.7 dB. If such a hearing aid picks up sound having a frequency of 300 Hz at an intensity of 2.58 x 10-11 w/m2, determine the sound intensity the hearing aid delivers to the eardrum. |W/m2

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QUESTION 1 In a private office, the fire alarm sound level should be a minimum of dB, and dB above ambient. In a residential bedroom, the fire alarm sound level should be a minimum of dB.