Standing waves super basic im dumb

  • #1
jamcintyre1
6
0

Homework Statement



The 4th node of a standing wave occurs at a position of 4.10 meters. Where is the 2nd antinode?

Homework Equations



nodes occur at: x=n*(λ/2)
antinodes: x=(n+.5)*(λ/2)

The Attempt at a Solution


n=4??
4.1m=2λ→λ=2.05m
now n=2? x=(2+.5)*(λ/2)≈2.56m wrong!
x=1.54m
 

Answers and Replies

  • #2
PeterO
Homework Helper
2,436
62

Homework Statement



The 4th node of a standing wave occurs at a position of 4.10 meters. Where is the 2nd antinode?

Homework Equations



nodes occur at: x=n*(λ/2)
antinodes: x=(n+.5)*(λ/2)

The Attempt at a Solution


n=4??
4.1m=2λ→λ=2.05m
now n=2? x=(2+.5)*(λ/2)≈2.56m wrong!
x=1.54m

No answer to that question as it stands.

Was there any particular feature of the standing wave at position 0.00 metres?
 
  • #3
jamcintyre1
6
0
I didn't get any more info. the solution has a sin graph I think with the 2nd antinode as the 2nd max which mazes sense, so 1.5*wavelength/2. But I can't figure out why the equation won't work. Thanks for your help btw. I'll take a look at you question.
 
  • #4
PeterO
Homework Helper
2,436
62
I didn't get any more info. the solution has a sin graph I think with the 2nd antinode as the 2nd max which mazes sense, so 1.5*wavelength/2. But I can't figure out why the equation won't work. Thanks for your help btw. I'll take a look at you question.

This standing wave ..

Is it on a string, fixed at one end at 0.00

Is the standing wave in an open pipe? An open pipe that runs form 0.00m to some distant point?

Is this standing wave in a stopped pipe? A stopped pipe with its stopped end at 0.00?
 

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