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Unformatted text preview: 100 dB one meter away from a loundspeaker which broadcasts in all directions. (a) Determine determine the sound level 1km away. (b) Is this soft/loud/inaudible? (c) What is the pressure deviation from equilibrium relative to atmospheric pressure (1atm ≈ 1 bar = 10 5 N/m 2 remember!) one meter from the loadspeaker 4. Sound 2 The following picture shows the Pressure measured while beating two frequencies f 1 and f 2 .21.510.5 0.5 1 1.5 2 2 4 6 8 10 ∆ P time in units of milli sec Beats (a) Estimate from the ﬁgure these two frequencies. You may ﬁnd it convenient to work the next problem ﬁrst. (b) Show that the sum of two sin waves sin(2 πf 1 t ) and sin(2 πf 2 t ) can be written as a product of sin and cos waves. 1...
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This note was uploaded on 01/25/2012 for the course PHYSICS 141 taught by Professor Teaney during the Fall '10 term at SUNY Stony Brook.
 Fall '10
 teaney
 Physics, Work

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