Physics
NULL
Medium
Question
Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
A
Newton
B
Einstein
C
Michelson
✓ Official correct answer
D
Galileo
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A
Newton
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B
Einstein
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C
Michelson
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D
Galileo
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Explanation
Michelson used the wavelength of red cadmium light to define the length of the meter with high precision (1893).
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