# what does phase-shift mean???Watch

#1
the title pretty much says it all. i've looked in my maths textbook, ive googled it, etc, but i cant find the answer. please help. my exam's tomorrow morning
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12 years ago
#2
If you've a plane wave written as than a phase shift would be multiplying by . The phase shift amount is .
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12 years ago
#3
A transformation under which an oscillating function will move left/right with respect to the x-axis. E.g. sin(x-30) is a phase shift of sin(x) by 30.
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#4
dont really understand either definition, but say there is a graph of y = 3cos (6theta + 180), would the phase shift be -30 because it's -180/6???
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12 years ago
#5
In that case, if you've a sin or cos function with the transformation . The shift is .
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#6
(Original post by AlphaNumeric)
In that case, if you've a sin or cos function with the transformation . The shift is .
so is my answer correct? btw, this is in reference to c2
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12 years ago
#7
(Original post by alison_141288)
so is my answer correct? btw, this is in reference to c2
yes

y = 3cos (6theta + 180)

would be a shift of -30 of the graph y=3cos(6theta)
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12 years ago
#8
Yup, the phase shift is -30 (or perhaps 30 depending on your conventions, but I'd say -30).

The function is

Thus compared to the function you've shifted the phase by thirty degrees.
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