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Speed of Sound Waves
Objectives: To define sound and figure out how density affect its speed.
Definition of Sound: longitudinal mechanical wave that travels through an elastic medium.
Factors determining the Speed of Sound.
Sound waves have a wave speed dependent on elasticity and density.
A dense medium has lower wave speeds.
A medium that is more elastic springs back quicker and results in faster speeds (Bulk Modulus)
Textbook Equation
Bv
Question 1: Find the speed of sound in air at 200C. p = 1.2 kg/m3
B = 1.01 x 105 Pa (From the textbook)
V= sqrt(1.01x 105/1.2) = 343m/s
Question 2: What is the velocity of sound in air on a day when the temperature is equal to 270C?
We know that speed at 200C = 343 m/s
V= 343 x sqrt(Final temp/Initial temp)
= 343 x sqrt(300/293) = 347 m/s
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