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| Q.23 | 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? | |
| Ans | 1. 1846 | |
| 2. 1844 | ||
| 3. 1842 | ||
| 4. 1840 |
Correct Ans Provided: 3
