Question

The modern definition of a meter is in terms of wavelength of light but not in terms of length of platinum rod. Explain.

Answer 1

The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 second.

Answer 2

Answer:

The metre is currently defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. ... In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86.

Explanation:

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