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Devakinandan, Ojas, Shivang, Dev Aditya
The Doppler Effect is a phenomenon observed with both sound and light. It is used to determine the distance between an object relative to the position of a person based on the frequency of the light or sound that the person perceives. For Example in the context of light the redshift of the light at a lower frequency shows the object is moving further while the blue shift means it is moving closer. The Doppler Effect is often used in astronomy as a means of finding if an object is moving further or closer to the observer.
Red shift is an event where the light from distant galaxies appears to be shifted towards the red end of the visible range. The shift is caused by the expansion of the universe, which causes the light waves to stretch out and become a darker shade of red.
Doppler blueshift is caused by movement of a source towards the observer. The term applies to any decrease in wavelength caused by relative motion, even outside the visible spectrum. The wavelength of any reflected or emitted photon or other particle is shortened in the direction of travel.
As an ambulance is driving by an observer, its siren is perceived as high pitched as it is moving toward the observer, and then switches to a lower pitch as it moves past and away from the observer.
A duck that is paddling and floating across a pond creates water waves and ripples as it paddles. The waves bunch up in front of the duck as it swims forward, and the waves are more spread out behind the duck.
Bettex, Morgan. “Explained: The Doppler Effect.” MIT News | Massachusetts Institute ofTechnology,3Aug.2010,news.mit.edu/2010/explained-doppler-0803#:~:text=The%20Doppler%20effect%2C%20or%20Doppler,the%20source%20approaches%20the%20observer. Accessed 27 Mar. 2023.
Doppler. “Doppler Effect.” The Economic Times, 2023, economictimes.indiatimes.com/definition/doppler-effect. Accessed 29 Mar. 2023.
to, Contributors. “Any Decrease in Wavelength (Increase in Frequency).” Wikipedia.org, Wikimedia Foundation, Inc., 28 Mar. 2014, simple.wikipedia.org/wiki/Blue_shift#:~:text=Doppler%20blueshift%20is%20caused%20by,in%20the%20direction%20of%20travel. Accessed 29 Mar. 2023.