# Waves mcq

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#1
Hi,

Bit confused on why the answer is A for the following question.

Appreciate the help, thank you.
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1 month ago
#2
The maximum occurs when the waves are in phase (out of phase by zero)... here the result is the amplitudes add together because you're getting the peaks of wave one arriving at the same position as the peaks of wave two at the same time... and the same for the troughs

The minimum occurs when the waves are out of phase by 180 deg... here the result is the difference between the amplitudes because you're getting the troughs from wave one arriving at the same position as the peaks from wave 2 at the same time - and also the peaks from wave one arriving at the same time as the troughs from wave two.

if the interfering waves are equal amplitude the difference between the amplitudes is of course zero
1
#3
(Original post by Joinedup)
The maximum occurs when the waves are in phase (out of phase by zero)... here the result is the amplitudes add together because you're getting the peaks of wave one arriving at the same position as the peaks of wave two at the same time... and the same for the troughs

The minimum occurs when the waves are out of phase by 180 deg... here the result is the difference between the amplitudes because you're getting the troughs from wave one arriving at the same position as the peaks from wave 2 at the same time - and also the peaks from wave one arriving at the same time as the troughs from wave two.

if the interfering waves are equal amplitude the difference between the amplitudes is of course zero
Ah I see. I thought it was just talking about when the waves were in phase so that the maximum amplitude is 4a and minimum is 0, but now I understand you have to consider both constructive and destructive interference.
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