In which year was the Doppler effect discovered by Austrian scientist Christian Doppler, that describes the change in frequency of any kind of sound or light wave produced by a moving source with respect to an observer?

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**Solution:**

1. The Doppler effect was discovered by the Austrian physicist Christian Doppler.

2. He published his theory in 1842 in the paper titled "Über das farbige Licht der Doppelsterne und einiger anderer Gestirne des Himmels" (On the coloured light of the binary stars and some other stars of the heavens).

3. The Doppler effect explains the change in frequency or wavelength of waves (sound or light) as perceived by an observer when the source of the waves is moving relative to the observer.

**Answer:** 1842

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