A Pneumatic Warning Siren. A pneumatic siren can be made by blowing a narrow jet of air through equally spaced hole disk. The time it takes for successive holes to pass thought the jet stream is equal to the period of the resulting sound wave. You and your team are designing such a device to be used as a community warning alarm to be activated in the case of severe weather, or othe dangerous situations. The siren should produce a tone as close as possible to 710Hz, and people with average hearing should be able to detect it above normal conversation at a distance of at least 2.0 miles. The circular pattern of holes will be located 24 cm from the center of a thin aluminum disk, and the motor that rotates the disk runs at 1500 rpm. (a) What even integer number of equally spaced holes will result in a sound frequency closest to the desired 710 Hz? (b) What should be the minimum sound output power of the siren in watts (W) so that people with average hearing can detect it above normal conversation at a distance of 2.0 miles from the source? You can assume that the output is isotropic, that is, it emanates like a spherical wave, and that the sound intensity of normal conversion is 3.20 x 10-6 W/m2 (from Table 16.2). P

A Pneumatic Warning Siren. A pneumatic siren can be made by blowing a narrow jet of air through equally spaced hole disk. The time it takes for successive holes to pass thought the jet stream is equal to the period of the resulting sound wave. You and your team are designing such a device to be used as a community warning alarm to be activated in the case of severe weather, or othe dangerous situations. The siren should produce a tone as close as possible to 710Hz, and people with average hearing should be able to detect it above normal conversation at a distance of at least 2.0 miles. The circular pattern of holes will be located 24 cm from the center of a thin aluminum disk, and the motor that rotates the disk runs at 1500 rpm. (a) What even integer number of equally spaced holes will result in a sound frequency closest to the desired 710 Hz? (b) What should be the minimum sound output power of the siren in watts (W) so that people with average hearing can detect it above normal conversation at a distance of 2.0 miles from the source? You can assume that the output is isotropic, that is, it emanates like a spherical wave, and that the sound intensity of normal conversion is 3.20 x 10-6 W/m2 (from Table 16.2). P

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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Concept explainers

Properties of sound

A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).

Quality Of Sound

A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.

Categories of Sound Wave

People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.

Question

A Pneumatic Warning Siren. A pneumatic siren can be made by blowing a narrow jet of air through equally spaced holes on a rotating
disk. The time it takes for successive holes to pass thought the jet stream is equal to the period of the resulting sound wave. You and
your team are designing such a device to be used as a community warning alarm to be activated in the case of severe weather, or other
dangerous situations. The siren should produce a tone as close as possible to 710Hz, and people with average hearing should be able
to detect it above normal conversation at a distance of at least 2.0 miles. The circular pattern of holes will be located 24 cm from the
center of a thin aluminum disk, and the motor that rotates the disk runs at 1500 rpm. (a) What even integer number of equally spaced
holes will result in a sound frequency closest to the desired 710 Hz? (b) What should be the minimum sound output power of the siren
in watts (W) so that people with average hearing can detect it above normal conversation at a distance of 2.0 miles from the source?
You can assume that the output is isotropic, that is, it emanates like a spherical wave, and that the sound intensity of normal
conversion is 3.20 x 10-6 W/m² (from Table 16.2).
(a) Number
(b) Number
Units
Units

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