# How do you find frequency given this wave graph?

1. Apr 21, 2013

### cmkc109

1. The problem statement, all variables and given/known data

How do you find wavelength given this wave graph? [ignore my title please]

2. Relevant equations

c= (wavelength)(frequency)

3. The attempt at a solution

I always see displacement (y) vs distance (x) graph, but this one is displacement (x) vs t

I'm kinda confused how you solve for the wavelength

can someone help me with interpreting this graph?

I know the question is asking for frequency, but is it possible to figure out the wavelength given this graph?

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2. Apr 22, 2013

### ehild

The problem asks the frequency. You get the wavelength if you know the speed of the wave in that medium, but it is not given.

ehild

3. Apr 22, 2013

### cmkc109

ok thanks

4. Apr 22, 2013

### SammyS

Staff Emeritus

You can't solve for wavelength.

The particle moves back and forth periodically. What's the period of that motion?

5. Apr 22, 2013

### cmkc109

1 wave is 0.05 sec

frequency is the the number of cycles per sec
so here 1 cycle / 0.05 sec
so 1 sec/ 0.05 = 20

6. Apr 22, 2013

### SammyS

Staff Emeritus
What units ?