Halliday 2 Cap 18 - P18 064

Transcript

64. We use β = 10 log(I/Io ) with Io = 1 × 10−12 W/m2 and Eq. 18-27 with ω = 2πf = 2π(260 Hz), v = 343 m/s and ρ = 1.21 kg/m3 .
 1 I = Io 108.5 = ρv(2πf )2 s2m =⇒ sm = 7.6 × 10−7 m . 2