The wavelength range of the visible spectrum extends from violet (400 nm) to red (750nm). Express these wavelengths in frequencies (Hz) . (1nm `=10^(-9)`m)

Explanation

Frequency of violet light
`v=(c)/(lamda)=(3.00xx10^(8)"m s"^(-1))/(400xx10^(-9)m)=7.50xx10^(14)"Hz"`
Frequency of red light
`v=(c)/(lamda)=(3.00xx10^(8)"m s"^(-1))/(400xx10^(-9)m)=4.00xx^(14)"Hz"`
The range of visible spectrum is from `4.0xx10^(14)" to "7.5xx10^(14)`Hz in terms of frequency units.