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Q:

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

  • 1
    1846
  • 2
    1844
  • 3
    1842
  • 4
    1840 
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Answer : 3. "1842"
Explanation :

The Doppler effect was discovered by Austrian scientist Christian Doppler in 1842, describing the change in frequency of any type of sound or light wave produced by a moving source with respect to an observer.

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