The wavelength of visible spectrum extends extends from violet (400 nm) tored (750 nm). Express the corresponding frequency ranges.

Answer

`7.5xx10^(14) Hz "to" 4.0xx10^(14)Hz`

Explanation

Frequency of violet radiation
`lambda=400nm=400xx10^(-9)m=4xx10^(-7)m , c=3xx10^(8)ms^(-1)`
`v=(c)/(lambda)=((3xx10^(8)ms^(-1)))/((4xx10^(-7)m))=7.5xx10^(14)s^(-1)`(Hz)
Frequency of red radiation
`lambda=750nm=750xx10^(-9)m=75xx10^(-8)m, c=3xx10^(8)ms^(-1)`
`v=(c)/(lambda)=((3xx10^(8)ms^(-1)))/((75xx10^(-8)m))=4.0xx10^(14)s^(-1)` (Hz)`