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

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Wavelength `( lambda) = 4 xx 10^(7) nm = 4 xx 10^(-2) m( 1nm = 10^(-9)m)`
Wavelength `( bar(v))= (1)/( lambda)`
`= (1)/( 4 xx 10^(-2)m) `
`bar(v) =25m^(-1)`
Frequency `(v)= (c ) /( lambda)`
`v = ( 3 xx 10^(8))/( 4 xx 10^(-2) m) = 7.5 xx 10^(8) s^(-1)`
`v= 7.5 xx 10^(9) s^(-1)`
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