The Doppler Effect is a phenomenon in physics where the frequency of a wave changes for an observer moving relative to the source of the wave. This effect is commonly experienced when a siren passes by a moving car. As the siren approaches the car, the frequency of the sound waves increases, leading to a higher pitch. Conversely, as the siren moves away from the car, the frequency decreases, causing a lower pitch. The mathematical equation for the Doppler Effect can be expressed as follows: f' = f (v + v₀) / (v + vₛ) Where: f' is the observed frequency f is the emitted frequency v is the speed of sound in the medium v₀ is the speed of the observer vₛ is the speed of the source Understanding the Doppler Effect has many practical applications in various fields, such as Doppler radar in weather forecasting, medical ultrasound imaging, and even in astronomy to determine the motion of stars and galaxies. By knowing how the Doppler Effect works, scientists can make accurate measurements and predictions based on the observed frequency shifts of waves.