Finding the Location of the 2nd Antinode in a Standing Wave at 4.10 Meters

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Homework Help Overview

The problem involves determining the location of the 2nd antinode in a standing wave, given that the 4th node is at 4.10 meters. The context is related to wave mechanics, specifically standing waves and their properties.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between nodes and antinodes, referencing equations for their positions. There is uncertainty about the calculations leading to the position of the 2nd antinode. Questions arise regarding the nature of the standing wave and its setup, including whether it is on a string or in a pipe.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some have attempted calculations but express confusion about the results. Questions about the physical setup of the standing wave indicate a productive direction for further inquiry.

Contextual Notes

Participants note the lack of additional information about the standing wave's characteristics, which may affect the problem's interpretation. There is also mention of a sine graph related to the standing wave, suggesting a visual representation that may aid understanding.

jamcintyre1
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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
 
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jamcintyre1 said:

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?
 
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.
 
jamcintyre1 said:
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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