Module 6- Real-World Physics Discussion

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Embry-Riddle Aeronautical University *

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102

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Physics

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Nov 24, 2024

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docx

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1 Hello Class, In this week module, we learn about Waves and Sound. One topic I would like to talk about is the Doppler effect. According to our textbook, the Doppler effect is defined as “the apparent change in frequency of wave fronts emitted by a moving source, perhaps a tugboat floating down a river or a train traveling along a track, each blowing its horn” (Ostdiek, 2018). This effect is what causes to hear sound differently depending on the distance to the source. Using the picture below to put things into perspective, as a police car approaches the guy and blow its horn, the wave fronts bunch together, creating smaller wavelengths resulting in higher frequency sounds, interpreted as a higher pitch sound. Conversely, when the police car moves away from the girl the wave fronts are further apart creating larger wavelengths leading to a lower frequency, interpreted as a low pitch sound. One thing to note about the doppler effect is that it occurs in both sound and light (Ostdiek, 2018). One example on how the doppler effect is used in aviation is in our radar and sonar to detect different things. Both operates on the principle of echolocation and the doppler effect. Using the picture below as an example, by emitting a microwave and detecting the reflected wave off the moving car, we can find out the wavelength and frequency of the reflected wave, allowing us to detect the distance the car is from us. As the car moves closer, the frequency and wavelength changes, allowing us to know the car's speed and distance from us. Applying this to aviation, this allows aircraft to detect other aircrafts and keeping track of their position, allowing it to avoid them. References Ostdiek, V., & Bord, D. (2018). Inquiry into physics (8th ed. ed.). Cengage Learning Custom Publishing.

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