Emmanuelle said:Ben is walking in a park in a straight line at 1.2 m/s. A bird is hiding in a bush. When Ben is closest to the bush, he is 2 m away from the bird and he hears a 10 dB sound. How long will he continue to hear the bird?
Thanks for your help!
The Doppler effect is a phenomenon in which the frequency of a sound or light wave appears to change when the source of the wave is moving relative to the observer.
The Doppler effect works by changing the perceived frequency of a wave based on the relative motion of the source and observer. When the source is moving towards the observer, the frequency appears higher, and when the source is moving away, the frequency appears lower.
In the Doppler effect problem with an observer moving away, the frequency appears to decrease due to the relative motion of the source and observer. In other scenarios, such as when the source is moving towards the observer, the frequency appears to increase. The direction of the relative motion determines the direction of the frequency change.
The Doppler effect is used in various real-life situations, such as in weather forecasting to track the movement of storms, in radar technology to detect the speed and direction of moving objects, and in medical imaging techniques to produce images of internal body structures.
The formula for calculating the Doppler effect in the case of an observer moving away is f' = f * (v / (v ± vo)), where f' is the perceived frequency, f is the actual frequency, v is the speed of the wave, and vo is the speed of the observer.