appear, so L = 2(λ/2) and = L. Calculate the tension. λ 7. Repeat for L = 3(λ/2), L = 4(λ/2) and L = 5(λ/2). Find the percent difference between your measured speed v = fλ and the theoretical value. 8. Repeat steps 1 - 7 for a different string. 3. AIR COLUMN RESONANCE PURPOSE: To make use of resonance modes in an air column to determine: a) The of sound. b) The wavelength of sound at different frequencies. INTRODUCTION: L1 = (1/4)λ, so L2 = (3/4)λ, so L3 = (5/4)λ, so = 4·L1 = (4/3)·L2 = (4/5)·L3 λ λ λ n = 1 mode n = 2 mode n = 3 mode Fig. 1 Air disturbances such as those set up by a vibrating tuning fork can be sent down a tube closed at the bottom and open at the top. Resonant modes can be detected when sound waves going down the tube combine with reflected waves going up the tube, to produce standing waves. (2n - 1) Resonance occurs at L = · , λ
appear, so L = 2(λ/2) and λ = L. Calculate the tension. 7. Repeat for L = 3(λ/2), L = 4(λ/2) and L = 5(λ/2). Find the percent difference between your measured speed v = fλ and the theoretical value. 8. Repeat steps 1 - 7 for a different string. 3. AIR COLUMN RESONANCE PURPOSE: To make use of resonance modes in an air column to determine: a) The of sound. b) The wavelength of sound at different frequencies. INTRODUCTION: L1 = (1/4)λ, so L2 = (3/4)λ, so L3 = (5/4)λ, so λ = 4·L1 λ = (4/3)·L2 λ = (4/5)·L3 n = 1 mode n = 2 mode n = 3 mode Fig. 1 Air disturbances such as those set up by a vibrating tuning fork can be sent down a tube closed at the bottom and open at the top. Resonant modes can be detected when sound waves going down the tube combine with reflected waves going up the tube, to produce standing waves. (2n - 1) Resonance occurs at L = · λ ,
P39%20Lab%20Book.docx