The wave of wavelength 5900 Å emitted by...

The wave of wavelength `5900 Å` emitted by any atom or molecule must have some finite total length which known as coherence length. For sodium light, this length is `2.4cm`. The number of oscillation in this length will be,

`4.068xx18^(8)`

`4.068xx10^(4)`

`4.068xx10^(6)`

`4.068xx10^(5)`

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