# edexcel as physicsWatch

#1
can someone plz help :

i dont understand some certain things about waves such as phase difference path difference .

0
4 years ago
#2

http://physics.stackexchange.com/que...ath-difference

enjoy
0
4 years ago
#3
Phase difference is difference in peaks and troughs of two waves.

Path difference is the difference in terms of a wavelength when the waves have reached a certain point.

So if Wave A and B far apart and have a wavelength of 4m.

If point C is 8m away from A but 10m away from B, A will have finished the two cycles, but B will half way through its third cycle.

So phase différence in terms of lambda is lambda/2 = destructive interference

If it's a whole number itll be constructive
0
#4
(Original post by L'Evil Fish)
Phase difference is difference in peaks and troughs of two waves.

Path difference is the difference in terms of a wavelength when the waves have reached a certain point.

So if Wave A and B far apart and have a wavelength of 4m.

If point C is 8m away from A but 10m away from B, A will have finished the two cycles, but B will half way through its third cycle.

So phase différence in terms of lambda is lambda/2 = destructive interference

If it's a whole number itll be constructive

i have a question
0
#5
the question is: Two coherent sources emit waves of wavelength λ in phase. At a point where the two waves meet they have a phase difference of 90° ( 2 radians). Which of the following
could be the path difference at this point?
0
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