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gates down a string. Two points 30 cm apart

are out of phase by (5*pi)/3

What is the wave length of the wave? An-

swer in units of cm.

Im kinda lost here, Im unsure how wave length will relate to the given info. Im sure the phase is part of the relation but Im unsure of how. The best Ive been able to figure so far would be converting the frequency to a period, then using v= lambda/T.

I suppose phase is key to solving this problem, but maybe Im unsure of exactly how phase relates?

2) Given two equations Y1 = A / (Bx - Ct)^2 Y2= -A / (Bx + Ct - E)^2

At what time will the two waves exactly cancel everywhere? At what point do the waves always cancel?

Ive been reading in my book about this problem and Im unsure exactly what the case is for two waves to cancel each other out. I would assume they have to be exactly out of phase with each other, so that the peak of one corresponds with the valley of another. Although Im unsure how to meet this condition in the above equations.

Thanks for any help!