Can anybody briefly descibe calculation of phase difference in a stationary wave (in two different waves which are superposed and are same frequency and amplitude)
phase difference in stationary waves watch
- Thread Starter
- 15-03-2016 18:48
- Official Rep
- 17-03-2016 20:03
Sorry you've not had any responses about this.
Why not try posting in a specific subject forum- you might have more luck there.
Here's a link to our subject forum which should help get you more responses.
- 17-03-2016 20:08
phase difference is basically the difference in wavelength between two different waves. For example, the phase difference between sin(x) and cos(x) is 90 degrees or pi/4 radians. Two waves that are in phase share the same wavelength at the same time intervals e.g. sin(x) and 3sin(x)Last edited by TheFarmerLad; 17-03-2016 at 20:09.
- 17-03-2016 20:21
when waves are in phase it means that they are travelling together with their peak and trough are in line (think of it as 2 dolphins swimming together)
when waves are not in phase, one of the wave is half a wavelength behind or in front of the other wave and so there is a difference of 180 degrees between the two waves troughs and peak and so they cancel each other out - destructive waves
if there is a difference of 1 whole wave (360 degrees) then that will be in phase as the peaks and troughs will be in line again - constructive waves so the amplitude of the 2 waves will add up and the new amplitude will be the sum of the amplitude of the 2 old waves
i dont even know if this makes sense tbh lol
look at diagrams in textbooks or on the internet it will be easier to understand with them
- 17-03-2016 20:39
What the above have described is a correct and describes phase difference between two progressive waves - apart from MathsAstronomy12 who stated that a phase difference of 90 degrees is
pi/4 radians, when in fact it is:
In terms of calculations, you can work out phase difference using the following:
where d is the distance of the two points on one wave apart, and where the wavelength is lambda.