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Homework Statement
Derive the formula for the Doppler effect for a receiver traveling at an angle theta away from a planar source
Homework Equations
The Attempt at a Solution
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I thought that we can assume that the wavelength has two components ##λ_x## and ##λ_y## where
##λ_x = ct+vtcosθ## and I am not sure about ##λ_y##. Maybe ##λ_y = \sqrt {(ct)^2+ (vtsinθ)^2)}##
I am not sure how to start or approach please help.
Note : I cannot use wave equation.