velocity of wave

[chiddler]

1. f = 2v/L

v = Lf/2

2. v = f(lambda)

3. v=sqrt(T/nu) where T = tension, nu = mass/unit length

velocity of wave and velocity of the particle of the wave. #2 is for velocity of wave for sure. Is #3 describing velocity of particle or velocity of wave propagation?

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[syoung]

,not sure what your question is.
#1 is for waves for sure
2 is for waves and particles
3 is for waves on a string.

 

[chiddler]

,not sure what your question is.
#1 is for waves for sure
2 is for waves and particles
3 is for waves on a string.

My question is are equations #1 and #3 describing the velocity of a particle of the wave or the speed of wave propagation?

they are all for waves, of course.

 

[syoung]

if we are talking about light, it would be both!
uh...I think it should be wave propagation (if we look at a string, it's the entire thing moving up and down, but the individual particles don't move?). but i think 1 is particle.

 

[chiddler]

if we are talking about light, it would be both!
uh...I think it should be wave propagation (if we look at a string, it's the entire thing moving up and down, but the individual particles don't move?). but i think 1 is particle.

not necessarily light.

o_o waves in string do move! only not move at the nodes!

thinking more, #1 must be particle speed. but i'm not sure about #3.

 

[folktale]

Where would #1 apply? In other words, what types of problems would you use that equation?

 

[syoung]

strings, pipes (open/closed/both)

 

[chiddler]

ok! in my notes i found that i plugged in the v from sqrt(T/nu) into F=n(v/2L) so they are the same. both describe speed of particle of a wave.

i'd like to add that i'm not sure if the formal term is "particle", but this is the term milski used and i wrote it down :-x

 

[folktale]

strings, pipes (open/closed/both)

but that equation does not fit harmonic frequencies for strings or pipes

open pipe/string: f=nv/2L

closed pipe: f=nv/4L