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Frequency is inversely proportionate to wavelength.

That is, f = 1/(lamda)

You have frequency, 6.9810214 Hz

You want 'lamda'.

Re-arranging, you get lamda = 1/f = 1/6.9810214Hz = 0.1432m

Then you just need to convert that in to nm, note 1nm = 1*10-9m

So (0.1432/10-9) nm

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