The Doppler Effect describes the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave. When both the source and observer are in motion at an angle, the formula for calculating the observed frequency incorporates the angle of movement. Specifically, the observed frequency can be determined using the formula: f' = f (v + vo * cos(θ)) / (v - vs * cos(θ)), where f' is the observed frequency, f is the source frequency, v is the speed of sound, vo is the observer's speed, vs is the source's speed, and θ is the angle between the direction of the source and the observer.
PREREQUISITESPhysics students, audio engineers, and professionals in fields utilizing wave mechanics, such as telecommunications and medical imaging.