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

Explanation

Wavelength `( lamda ) = 4xx10 ^(7) nm = 4xx10 ^(-2) m ( 1.nm = 10 ^(-9)` m)
Wave number `( vecv ) =(1)/(lamda)`
`= (1)/( 4xx10^(-2) m)`
` vecv = 25 m ^(-1)`
Frequncy `(v) =(c )/(lamda)`
`v=(3xx10^(8) ms^(-1))/( 4xx10^(-2) m) = 7.5 xx10 ^(9) s^(-1)`
` v=7.5 xx10^(9) s^(-1)`