How many wavelengths of $K r^{86}$ are contained in one meter?

1553164.13

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652189.63

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2347127.23

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1650763.73

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Solution

The correct option is D $1650763.73$
An old definition (from 1960) of the meter involves using an orange line from the emission spectrum of ${K r}^{86}$ .
The wavelength of emission $= 6057.802106$
So that one meter equalled $= 1650763.73$

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