If surface roughness is within 14 to 16 of the sound

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Unformatted text preview: wing formula applies for the speed of sound in dry air at temperature T: v = v0 1 + T / °C 273.2 v0 = 331.6 m/s or v = v 0 + 0.58 ⋅ 176 mT ⋅ s °C © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals Solids (at 20 °C) v [m/s] Aluminium 5110 Iron 5180 Gold 2000 Cork 500 Copper 3800 Brass 3500 Steel 5100 Fluids (at 20 °C) v [m/s] Benzene 1320 Chloroform 1000 Glycerine 1923 Petroleum 1320 Mercury 1415 Water, distilled 1483 Gases (at 0 °C and 101.3 kPa) v [m/s] Argon 308 Helium 971 Carbon dioxide 258 Carbon monoxide 337 Air 332 Hydrogen 1286 Table 11.3.1: Speed of sound in various materials © Festo Didactic GmbH & Co. KG • FP 1110 177 11. Physical fundamentals Because of the short wavelength, ultrasonic waves behave in a similar way as light waves. Also, the law of optical geometry (angle of incidence = angle of reflection) applies to ultrasonic waves. The surface structure is of great significance as far as the directed reflection is concerned. If surface roughness is wi...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

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