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CIE physics paper 2

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Hwa1:
well we did variant 2
and the phase difrnce was 180 degree or pi/2  (antiphase)
and the amplitude was just A, same as the other point o.O

Dooraven:
Well its either A or -A for sure.

vince_24:
Amplitude is the maximum displacement. Antinode is place of maximum displacement. The point wasn't at an antinode so how exactly would the amplitude be A? Please enlighten me. Thanks.

kratos009:
Amplitude can still be any displacement from an equilibrium position, and they had said that the first particle was displaced from the equilibrium by amplitude A and considering the second point is 180 degrees phase difference, it must have the same displacement as the first particle but in the opposite direction. The displacement has to -A because displacement is a vector quantity and so it has both magnitude and direction  ;).

Hey tyserius, i was wondering which variant paper you did?

vince_24:
The phase difference was 270 degrees, was it not?
I am talking variant 2 here.

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