How many wavelength of kr86 are there in meter

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Solution

The answer is 1 650 763.73
This question relates to a definition of the meter that was in effect from 1960 until 1986, and stated that one meter was equal to the total length of 1 650 763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86.

(It has since been replaced by a definition based on the speed of light.)

Wavelength of Kr 86 is known to be 605 nm (orange in visible region )
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