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PHYS 101 Pre-Lab #5

# PHYS 101 Pre-Lab #5 - PHYS 101-20 Lab#5 Velocity of Sound...

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10/17/07 PHYS 101-20 Lab #5 – Velocity of Sound Objective : To use resonance points of a sound wave traveling through an open tube to measure the speed of sound in air. A standing wave is a stationary pattern produced by the interference of waves bouncing back and forth in a confined space. If a sound source is brought close to the top of a tube, a sound wave travels down the tube, reflects off of the water surface, and returns towards the top of the tube. The wave moving down and the wave moving up form an interference pattern that can be constructive or destructive. Constructive interference causes amplitude, a large increase in volume, which is caused by resonance. Equations: 1) x = L + λ /2 + L x = distance wave travels λ = wavelength L = tube length 2) λ = [4/(2 n -1)] L n = some integer 3) V = f λ V = velocity (m/s) f = frequency (hertz) To begin the experiment, fill a tube and metal cup, connected together with a rubber hose, with water. Bring the water level to around 5 cm from the top of the tube. Strike the tuning fork that vibrates at frequency 1024 Hz with the hammer while holding

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PHYS 101 Pre-Lab #5 - PHYS 101-20 Lab#5 Velocity of Sound...

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