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

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 / 4 (This is a number sentence!!!) 8.45 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 = 6 / 4 (0.80 m) = 1.2m 1.2 m W The wavelength is 0.80 m long. What is the length of the standing wave?

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 = 2 / 4 (1.24 m) = m v = f, f = v/ = (343 m/s)/(1.24 m) = 277 Hz m, 277 Hz W The wavelength is 124 cm long. What is the length of the waveform? If it is a sound wave (v = 343 m/s), what is its frequency (v = f )

= v/f = (335m/s)/(480 Hz) = … m L = 6 / 4 = 6 / 4 (0.6979… m) = ≈ 1.05 m 1.05 m W The third harmonic on a flute (both ends open pipe) has a frequency of 480. Hz. How long is the waveform if the speed of sound inside the flute is 335 m/s?

0.65 m = 14 / 4 = 4 / 14 (0.65 m) = … m v = f, f = v/ = (156 m/s)(0.1857… m) = 840 Hz 840 Hz W What is the frequency of the 7 th harmonic on a 0.65 m long guitar string where the speed of the waves is 156 m/s

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