First slide

Measurement

Question

How many wavelengths of $K r^{86}$ are there in one metre?

Moderate

A

1553164.13
B

1650763.73
C

652189.63
D

2348123.73

Solution

According to definition, metre is the distance containing 1650763.73wavelength in vacuum of radiation corresponding to orange red light emitted by an atom of Kr-86.

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