You are Here: Home >< Physics

Standing Waves (Coursework) watch

1. Hi,

I am currently doing an A2 piece of coursework on standing waves and i was wondering if anyone can explain to me why length, weight and tension affect the frequencies required to produce the first and second Harmonics (individually).

I know it might be obvious, but we're doing the A2 coursework before the A2 course ( and the teacher demanded our coursework had to be "A2 level" )

Thanks for any help
2. I'm assuming this if for a wave on a string. The equation for wavespeed is . This comes out of the wave equation for a string under tension which I'm guessing you probably don't need to but it can be worked out by analysing the forces on a segment of the string.

The fundamental frequency occurs when so from you get where v depends on mass, length and tension.

This site goes through the derivation of the wave equation for a string under tension. The main points are to resolve the forces in the horizontal and vertical directions. The string only moves up/down so the horizontal forces balance whereas the vertical forces are responsible for the motion of the string.
3. Greater tension = greater wave speed
Length determines what wavelength waves will fit
Not sure what you mean by weight, weight of string? anything other than this will just create tension
4. (Original post by suneilr)
I'm assuming this if for a wave on a string. The equation for wavespeed is . This comes out of the wave equation for a string under tension which I'm guessing you probably don't need to but it can be worked out by analysing the forces on a segment of the string.

The fundamental frequency occurs when so from you get where v depends on mass, length and tension.

This site goes through the derivation of the wave equation for a string under tension. The main points are to resolve the forces in the horizontal and vertical directions. The string only moves up/down so the horizontal forces balance whereas the vertical forces are responsible for the motion of the string.
Thanks a lot, HUGE help!
5. (Original post by ojpowermake)
Thanks a lot, HUGE help!

Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: July 13, 2009
Today on TSR

Results day under a month away

How are you feeling?