S1S2 Draw the line showing the third nodal line to the left of the perpendicular

S1S2
Draw the line showing the third nodal line to the left of the perpendicular bisector.
What kind of interference is occurring at the location of the square shown to the right of the perpendicular bisector?
c) How many nodal lines will there be including all lines to the left and the right of the perpendicular bisector?
d) In the diagram above, the distance between P and S1
is 12.0 cm. The distance between P and S2
is 9.0 cm. Using the equation  , determine the wavelength.
If the speed of the waves is 5.0 cm/s, what must be the frequency?

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