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

Explanation

Wavelength of violet light `= 400 nm` ltbr. `= 400 xx 10^(-9) m ( 1nm = 10^(-9)m)`
Frequency `(v) =( c )/( lambda) =( 3xx 10^(8) ms^(-1))/( 400 xx 10^(-9)m)`
`=7.50 xx 10^(14) Hz`
Wavelength of red light `= 750 nm`
`= 750 xx 10^(-9) m`
`v= (c )/ ( lambda) = ( 3 xx 10^(8)ms^(-1))/( 750 xx 10^(-9)m)`
` v = 4.0 xx 10^(14) Hz`

The range of visiblespectrumm is from `4.0 xx 10^(14)` Hz to `7.5 xx 10^914)` Hz in terms of frequency units.