Standing Waves Contents: Basic Concept Drawing standing waves Counting quarter wavelengths Calculating wavelengths.

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Presentation transcript:

Standing Waves Contents: Basic Concept Drawing standing waves Counting quarter wavelengths Calculating wavelengths

What standing waves are TOC Demo with spring…

Basic Concept TOC Waves interfering constructively with their own reflection Show on whiteboard

More standing waves TOC Demo with wave demo…

Skill zero - Drawing the pictures Whiteboard 1 - Draw the first three possible harmonics of both ends fixed. TOC

Skill zero - Drawing the pictures Whiteboard 2 - Draw the first three possible harmonics of both ends free. TOC 1 2 3

Skill zero - Drawing the pictures Whiteboard 3 - Draw the first three possible harmonics of one end free, one end fixed. TOC 1 3 5

Skill one - calculating wavelength TOC Concept 0: A full wavelength looks like this (two footballs) Concept 1: A quarter wavelength is the smallest unit of currency: 1/41/4 1/41/4 1/41/4 1/41/4 Concept 2: So let’s count the quarter wavelengths:

Counting Quarter wavelengths 11 | 2 | 3 | 4234 TOC

Uh - Two quarter wavelengths L = 2 / 4 2/4 W How many Quarter wavelengths?

Uh - four quarter wavelengths L = 4 / 4 4/4 W How many Quarter wavelengths?

Uh - three quarter wavelengths L = 3 / 4 3/4 W How many Quarter wavelengths?

Uh - six quarter wavelengths L = 6 / 4 6/4 W How many Quarter wavelengths?

L = 3 / m = 3 / 4 = 4 / 3 ( 8.45 m) = m = 11.3 m This waveform is 8.45 m long. What is the wavelength of the standing wave? Calculating wavelength TOC

Calculating wavelengths 11 | 2 | 3 | 4234 TOC

L = 5 / 4 = 4 / 5 (.45 m) =.36 m.36 m 36 cm W The waveform is 45 cm long. What is the ?

L = 6 / 4 = 4 / 6 (1.20 m) =.80 m.80 m 80 cm W The waveform is 1.20 m long. What is the ?

L = 1 / 4 = 4 / 1 (2.42 m) = 9.68 m v = f, f = v/ = (343 m/s)/(9.68 m) = 35.4 Hz 9.68 m, 35.4 Hz W The waveform is 2.42 m long. What is the ? If it is a sound wave (v = 343 m/s), what is its frequency (v = f )

L = 2 / 4 = 4 / 2 (.62 m) = 1.24 m v = f, f = v/ = (343 m/s)/(1.24 m) = 277 Hz 1.24 m, 277 Hz W The waveform is 62 cm long. What is the ? If it is a sound wave (v = 343 m/s), what is its frequency (v = f )

Work Together Work these out on the whiteboard Note the patterns of frequencies

This string is 32.0 cm long, and has a wave speed of m/s. Find for each mode 1. The wavelength, 2. The frequency. Hint v = f = ____, f = ____

This pipe is m long, sound travels at 343 m/s along the pipe. Find for each mode 1. The wavelength, 2. The frequency. Hint v = f = ____, f = ____

This pipe is also m long, sound travels at 343 m/s along the pipe. Find for each mode 1. The wavelength, 2. The frequency. Hint v = f = ____, f = ____ This one is different…

Demonstrations (might spill into the next day) Modes Elastic string/frequency generator/strobe WeedWhacker Guitar harmonics Penny whistle harmonics L wavesL waves vs. T waves - (Click on link)T waves Length of medium (as wavelength decreases, frequency increases) Guitar frets Penny whistle holes Straw 1 Straw 2 Evolution of brass instruments… Pipes on flame The large Flame Pipe/singing/music Pan pipes