# Homework Help: Superposition of waves

1. May 4, 2007

### bilals

1. The problem statement, all variables and given/known data

2. The attempt at a solution

i knew how to solve questions one and three..please help me in question number 2...here is what i did....

Question 1

(2*pi*x)/(wavelength)=pi/3

where x is the distance between the two waves (5cm)

and therefore we get the wavelength = 30cm

Question 2

(2*pi*x)/30 - wt = difference in phase

(2*pi*x)/30 - (2*pi*f)(7.5*10^-3) = difference in phase

is this correct,,if so how can i get x ..because i think it would be different

Question 3

v = wavelength * frequency
= 0.3*45

Last edited: May 4, 2007
2. May 4, 2007

### bilals

can anybody help...plz

3. May 4, 2007

### bilals

i tried myself and i got the correct answer for question number 2

difference in phase = wt
difference in phase = (2*pi*f)(7.5*10^-3)
difference in phase = (2*pi*45)(7.5*10^-3)

then divide by pi ..to get the answer as a multiple of pi
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