# Speed of standing wave

by Spirochete
Tags: speed, standing, wave
 P: 127 1. The problem statement, all variables and given/known data The standing wave in the picture is oscillating at 100 Hz. What is it's velocity? 2. Relevant equations Velocity=(wavelength)(frequency) I believe is the equation that applies here. 3. The attempt at a solution The wavelength from the picture appears to be 20x10-2 meters. So velocity should equal (20x10-2)(100)= 20 meters per second But I know this answer is wrong. Where am I going wrong? Attached Thumbnails
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P: 37,604
 Quote by Spirochete 1. The problem statement, all variables and given/known data The standing wave in the picture is oscillating at 100 Hz. What is it's velocity? 2. Relevant equations Velocity=(wavelength)(frequency) I believe is the equation that applies here. 3. The attempt at a solution The wavelength from the picture appears to be 20x10-2 meters. So velocity should equal (20x10-2)(100)= 20 meters per second But I know this answer is wrong. Where am I going wrong?
Why do you say that the wavelength is 20cm? Draw a full cycle of a sine wave -- what does it look like?

Also, be careful with your units. It looks like you are mixing cm and meters in your multiplication and answer....?

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