Doppler effect

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A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

The Doppler effect (also Doppler shift) is the change in the frequency or, equivalently, the period of a wave in relation to an observer who is moving relative to the source of the wave. It is named after the physicist Christian Doppler, who described the phenomenon in 1842.

Excerpt from the Wikipedia article “Doppler effect”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sense Jan van der Molen, CC BY-SA 4.0, via Wikimedia Commons.