[January 2013 WJEC] Points that are In Phase with Eachother - Explanation Marks

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person287
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For Part III, how would you justify that Points B and D are in Phase with A, and C isn't, because the Mark Scheme just gives 2 Marks for a 'Valid Explanation' but what would it be - I put B is in Line with A & so when it's going in one direction A is too, C isn't and points on a progressive wave constantly differ in phase and D is the corresponding point on the next cycle and I don't know if that's a real explanation or they'd be some terms they want.
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Stonebridge
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Yes.
B is at the same point as A on the wavefront and must be in phase with A.
D is at the corresponding point on the next wavefront and so is in phase with A. (It's a 360 degree phase shift which puts it back in phase with A.
C is less than one whole wave ahead of A and must be out of phase as the pahase angle will be greater than 0 but less than 360.
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person287
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Thanks
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