# Waves, pulses, sound and things of that nature

## Homework Statement

http://insight.ccsf.edu/file.php/4599/PDF/Exam1-Fall-2011.pdf

## Homework Equations

v^2=T/μ
κλ=2∏
ω=2f and many more

## The Attempt at a Solution

Starting with 1a the λ is 4/3*.015cm=.02cm since by the diagram the distance between the labeled point is 3/4 the wavelength

Now I'm not so sure about v. I don't think the diagram is used but in the given info in the statement. v=.3cm/.00075s right

And then the f is equal to v/λ right

I'll get to more later. I need to finish some astronomy homework real quick lol

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for f may need to use displacement=2*pi*f*t or more exactly 0.3cm=2*pi*f*.00075s actually. what do you think

for 1b im thinking dU/dx equals zero at (Xa,t1) and (Xb,t2). I'm still thinking about the other two. i know dy/dt=-v*dy/dx but am not certain of the values of dy/dt or dy/dx. I have a suspicion that dy/dx may be .5 at those other points.