Module 6- Real-World Physics Discussion

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Nov 24, 2024

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1 Waves and Sound While reading through this chapter, the biggest “Aha!” moment for me was during section 6.2c or the doppler effect section. As the book states, “you may be so used to this phenomenon that you didn’t notice it” (Ostdiek & Bord, 2018, p. 223). This statement held true for me because I have experienced situations where a cop, ambulance, or firetruck drove near me with their sirens on and when they passed me the siren noise suddenly drops. I did not know that this phenomenon was called the doppler effect. The doppler effect, by definition, is the apparent change in the frequency of wave fronts that are emitted by a moving source (Ostdiek & Bord, 2018, p.223). The doppler effects works because each wave expands from the point where the source was when it initially emitted that wave front. Often, when a source is at rest the wavelength is shorter and the frequency is higher. In contrast, in a moving source the wavelength is longer with lower frequency. The doppler effect not only effects sound but also light. This can be explored through the lights emitted by stars that are moving towards or away from the earth. The units used to solve the doppler effect include wavelength (, frequency (, and speed (). Wavelength is measured as the distance between two successive points in a wave (m). Frequency is measured as the number of oscillations per second (Hz). Finally, the speed is measured in meters per second (m/s). The doppler effects is used more often than I had originally anticipated. Echolocation is a major concept to discuss when talking about the impacts of the doppler effect. Echolocation is incorporated into the doppler effect because it allows us to immediately determine the speed of an approaching or departing object. The best example of this is the doppler radar gun. Law enforcement use the doppler effect to check the speeds of pedestrians on the roads. This is how they can determine if one is speeding. In the article, Noise doppler-Shift Measurement of Airplane Speed, the authors, Ivan Costa, and Alexandra Mocellin, discuss how the pitch of a passing aircraft and the doppler effect could be used to determine the speed of that aircraft. They also discuss other important applications that the doppler effect has. One example is the doppler echography used in the medical field. When the experiment was fully set up, they were able to determine the speed of the passing aircrafts at a local airport.

2 References Ostdiek, Bern J & Bord, Donald J. (2018). Inquiry into Physics. Cengage Learning. Retrieved on May 26, 2022, from Inquiry into Physics (virdocs.com) Costa F. Ivan & Mocellin A. (2007). Noise Doppler-Shift Measurement of Airplane Speed. Retrieved on June 30, 2022 from, (PDF) Noise Doppler- Shift Measurement of Airplane Speed (researchgate.net)

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