| 1 | A | B | C | D |
| --- | --- | --- | --- | --- |
| 2 | Speed of light - History |  |  |  |
| 3 | <1638 | Galileo, covered lanterns | inconclusive | inconclusive |
| 4 | <1667 | Accademia del Cimento, covered lanterns | inconclusive | inconclusive |
| 5 | 1675 | Rømer and Huygens, moons of Jupiter | 220000 | ‒27% error |
| 6 | 1729 | James Bradley, aberration of light | 301000 | +0.40% error |
| 7 | 1849 | Hippolyte Fizeau | 315000 | +5.1% error |
| 8 | 1862 | Léon Foucault, rotating mirror | 298000±500 | ‒0.60% error |
| 9 | 1907 | Rosa and Dorsey, EM constants | 299710±30 | ‒280 ppm error |
| 10 | 1926 | Albert A. Michelson, rotating mirror | 299796±4 | +12 ppm error |
| 11 | 1950 | Essen and Gordon-Smith, cavity resonator | 299792.5±3.0 | +0.14 ppm error |
| 12 | 1958 | K.D. Froome, radio interferometry | 299792.50±0.10 | +0.14 ppm error |
| 13 | 1972 | Evenson et al., laser interferometry | 299792.4562±0.0011 | ‒0.006 ppm error |
| 14 | 1983 | 17th CGPM, definition of the metre | 299792.458 (exact) | exact, as defined |

Question: What did Hippolyte Fizeau contribute to the measurement of the speed of light?
Answer: Hippolyte Fizeau determined the speed of light and reported a value of 315000.