HW 2

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Kent State University *

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21041

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Physics

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Apr 3, 2024

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2

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Reflection: Echoes bouncing off walls. Refraction: Bending of light as it passes through a prism. Diffraction: Water waves bending around obstacles. Transmission: light passes through a clear glass window Absorption: s ound waves travel through a soft material Scattering: Sunlight scattering in the Earth's atmosphere 340m/s for the speed of sound 1. Two speakers playing a sound of 680 Hz are separated by 3m. Find three spots between the two speakers where you will hear constructive interference. 340m/s = 680hz * λ λ= 340/680 = 0.5m L2-l1 = nλ 3-x -x =n*0.5 3-2x=0.5n n=1 3-2x=0.5 x= 1.25m n=2 3-2x=1 x= 1m n=3 3-2x=1.5 x= 0.75m 2. Two speakers playing a sound of 680 Hz are separated by 3m. Find three spots between the two speakers where you will hear destructive interference. 340m/s = 680hz * λ λ= 340/680 = 0.5m L2 -l1 =(n+½)λ 3-x -x =(n+½)*0.5 3-2x=(n+½)*0.5 n=1 3-2x=0.75 x= 1.125m n=2 3-2x=1.25 x= 0.875m n=3 3-2x=1.75 x= 0.625m 3. You are driving at 30m/s. A police car is chasing you at 35m/s. The police siren has a frequency of 800 Hz. What will be the frequency you hear? 340m/s = 800 hz * λ λ= 340/800 = 0.425m f= 0.425m( (340+30)/(340+35)) 0.419m
4. A band is marching at 2m/s. One squad is moving away from you. Another squad is moving toward you. If the band is playing the note A4, whose frequency is 440 Hz, what is the difference in frequencies you hear from the two squads? Will you be able to tell the difference? 340m/s = 440hz * λ λ= 340/ 440 = 0.773m L2-l1 = nλ 3-x -x =n*0.773 3-2x=0.773n n=1 3-2x=0.773 x= 1.1135m n=2 3-2x=1.546 x= 0.727m n=3 3-2x=2.319 x= 0.3405m As the 2 bands go by both of them in unison with one another will cause constructive interference, amplifying the audio. Not being able to tell the difference.
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