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

Explanation

Frequency of violet light
`v=(c )/(lambda) = (3.00xx10^(8) ms^(-1))/(400 xx 10^(-9) m)`
`=7.50 xx 10^(14) Hz`
frequency of red light
`v= (c )/(lambda) = (3.00 xx 10^(8) ms^(-1))/(750 xx 10^(-9) m)`
`= 4.00 x 10^(14) Hz`
The range of visible spectrum is from `4.0 xx 10^(14)` to `7.5 xx 10^(14)` Hz in terms of frequency