Calculate the frequency , wave number of the microwaves with `4 xx 10^(7) `nm

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Calculate the frequency , wave number of the microwaves with `4 xx 10^(7) `nm
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Answer is right but your calculations is wrong
How did you multiply 3× 10⁸ with lemda when the formula is c/lembda??

Kartikkumar_
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Frequency is wrong answer should be:- 25m-¹

ankitasoni