# Proof of Phase change

how can we proof the phase change from denser spring to a less dense one?

Do you mean 'prove' ? Please explain the problem more. Is this in relation to a simple harmonic oscillator ?

i mean how to prove these?
http://www.kettering.edu/~drussell/Demos/reflect/reflect.html [Broken]

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Do you mean phase changes in the earth which cause seismic reflections?

i think that's not related to the seismic reflection.

I want to know if there is any proofs of

"how do the wave speeds compare for the two strings?
From high speed to low speed (low density to high density)"
located at
http://www.kettering.edu/~drussell/Demos/reflect/reflect.html [Broken]

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AlephZero