[Answer] 2. Which Chris - a professor of mathematics, physics, and astronomy in Prague during the 19th century - is best known for his "shift" or "effect"?

Step 1 : Introduction to the question "2. Which Chris - a professor of mathematics, physics, and astronomy in Prague during the 19th century - is best known for his "shift" or "effect"?"

...1. Christopher Milne 2. Chris Czekaj 3. Saint Christina of Bolsena 4. Christian Doppler Christian Doppler (whose middle name is sometimes given as Andreas and sometimes as Johann) figured out a phenomenon in the physics of waves (such as sound and light) that we now call the "Doppler shift" or "Doppler effect" in his honor. We experience the Doppler effect when the sound of a passing train or emergency vehicle changes in relation to its distance from us and whether it is coming toward us or moving away (its sound frequency shifts upward when approaching, downward when moving away). Perception of any wave works this way, making Doppler radar possible. Don't ask me how: it's all in the math.

Step 2 : Answer to the question "2. Which Chris - a professor of mathematics, physics, and astronomy in Prague during the 19th century - is best known for his "shift" or "effect"?"

Christian Doppler:

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