SOLUTIONS – MONDAY, DECEMBER 10 16.13.IDENTIFY:For transverse waves, trans.Fvμ=For longitudinal waves, long.Yvρ=SET UP:The mass per unit length is related to the density (assumed uniform) and the cross-section area Aby .μAρ=EXECUTE:gives longtrans30vv=30YFρμ=and 900.ΥFρΑρ=Therefore, .900ΥFA=EVALUATE:Typical values of Yare on the order of so the stress must be about If Ais on the order of this requires a force of about 100 N. 1110 Pa,810 Pa.261 mm10 m ,−=216.20.IDENTIFY and SET UP:Apply the relation that is derived in Example 16.10. 2121(10 dB) log (/)IIββ−=EXECUTE:(a)( )4(10 dB)log6.0 dBIIβΔ==(b)The total number of crying babies must be multiplied by four, for an increase of 12 kids. EVALUATE:For 2,1α=where is some factor, the increase in sound intensity level is (10 dB)log .For 4,=6.0 dB.16.34.IDENTIFY:Constructive interference occurs when the difference of the distances of each source from point Pis an integer number of wavelengths. The interference is destructive when this difference of path lengths is a half
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