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# AS physics standing waves help watch

1. Hello,
I was just wondering whether anybody could help me to understand standing waves. My textbook says that the two waves have to have the same wavelength, frequency and speed and when a wave is reflected at one of the fixed points, they undergo a phase difference of 180 degrees. But what I don't understand is why doesn't this mean that the two waves are constantly in anti phase and so just cancel each other out?

2. This is a nice video explaining it
3. (Original post by Student403)

This is a nice video explaining it
Thank you so much- that was so helpful! So if I was in an exam could I say that only the wavefront is reflected so it has a phase difference of 180 degrees?
4. (Original post by Olivia197)
Thank you so much- that was so helpful! So if I was in an exam could I say that only the wavefront is reflected so it has a phase difference of 180 degrees?
No problem!

I'm not sure if you could say that. Because (please correct me if I'm wrong - I did this last year XD) aren't the wave fronts the peaks or whatever? It's actually not the peak that is the point of reflection, rather it is one of the points which is in the middle (Sorry I forgot the word.. You know the point which eventually makes the first node at the point of reflection?)
5. (Original post by Student403)
No problem!

I'm not sure if you could say that. Because (please correct me if I'm wrong - I did this last year XD) aren't the wave fronts the peaks or whatever? It's actually not the peak that is the point of reflection, rather it is one of the points which is in the middle (Sorry I forgot the word.. You know the point which eventually makes the first node at the point of reflection?)
Oh I see- it all makes sense now! Thank you
6. (Original post by Olivia197)
Oh I see- it all makes sense now! Thank you
My pleasure! Let me know if I can help with anything else! (Units 1 or 2)

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