Relationship between speed, frequency and wavelength:

$\overline{){\mathbf{v}}{\mathbf{=}}{\mathbf{f}}{\mathbf{\lambda}}}$

Condition for constructive interference:

$\overline{){\mathbf{\u2206}}{\mathbf{x}}{\mathbf{=}}{\mathbf{m}}{\mathbf{\lambda}}}$

Condition for destructive interference:

$\overline{){\mathbf{\u2206}}{\mathbf{x}}{\mathbf{=}}{\mathbf{(}}{\mathbf{m}}{\mathbf{+}}\frac{\mathbf{1}}{\mathbf{2}}{\mathbf{)}}{\mathbf{\lambda}}}$

Where Δx is the path difference and m is an integer.

m = 1,2,3...

The above conditions apply when the sources are coherent (in-phase).

When the sources are out of phase, the conditions are reversed. That is Δx = mλ describes condition destructive interference.

Two out-of-phase radio antennas at X = ± 300m on the x-axis are emitting 3.0 MHz radio waves.

Is the point (x,y) = (300m, 800m) a point of maximum constructive interference, perfect destructive interference, or something in between?

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