The relative motion of a motorcycle affects the frequency of the sound heard by an observer on the sidewalk, as the motorcycle approaches the observer, the frequency increases.
What is the doppler effect?
Change in the frequency of the sound or light due to the motion of the source or the observer is called the doppler effect.
- Because the motorcycle is the source and it seems to be approaching the observer, the wavelength decreases. Due to a decrease in the wavelength the frequency increases.
- Whenever the source moves close to the observer or the observer moves close to the source, the frequency increases.
- The frequency decreases when the source and observer stay away from each other.
This phenomenon is called the doppler shift or the doppler effect and hence motorcycle approaches the observer and the frequency increases is the right answer.
To learn more about the Doppler effect, refer to:
https://brainly.com/question/15318474
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