# Help with Physics? AS level OCR [Waves]

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#1
Hey

Are these right? Im not sure if I am understanding them correctly.

Phase difference refer to the relationship of two waves; how out of sync they are If their pattern is the same way then they're are in phase. If the pattern is opposite then it is anti phase.
Would 360degree have less phase difference than 720degree?

Also what is the difference of superposition and interference. I know they are different but they just seem the same to me?
I notice that superposition refers to displacement
Whereas interference refer to amplitude.
As I aware displacement vary depends where you position on the wave?
Lol I am pretty confused...

Coherence means the waves must be have a constand difference and same frequency right?

Thanks
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6 years ago
#2
360 degree phase difference is the same as zero as the wave repeats itself after 360 degrees. Same for 720.
Superposition is the principle you use to find what happens when you add (combine) waves. The resultant displacement of the wave is the vector sum of the displacements of the two waves at any point.
Interference is one of many wave effects which can be calculated by using the principle of superposition.
Amplitude is just the maximum displacement of a wave from its equilibrium position.
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