Answer to Question #240985 in Physics for camm

Question

a) The speed of sound through steel is 5,200 m/s. This is 2,520 m/s faster than the speed of sound through silver. Write and solve an equation to find the speed of sound through silver.

b) Find the speed of sound in a steel rod is Young’s modulus of steel is 2.07x1011Pa and its density is 78000kg/m3

c) What is the speed of sound in air when the temperature is 20°C? y=1.4, R=8.314J/mol K and the molar mass of air is 29 g/mol

Answer 1

(a) $c_{silver}=5200-2520=2680\ (m/s)$

(b) $c_{steel}=\sqrt{E/\rho_{steel}}=\sqrt{207\cdot10^9/7800}=5152\ (m/s)$

(c) $c=\sqrt{\gamma RT/M}=\sqrt{1.4\cdot8.314\cdot293/0.029}=343\ (m/s)$