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The wavelength range of the visible spec...

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)

Text Solution

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Using `c=vlamda` frequency of violet light.
`v=(c)/(v)=(3.00xx10^(8)ms^(-1))/(400xx10^(-9)m)`
`7.50xx10^(14)Hz`
Frequency of red light
`v=(c)/(v)=(3.00xx10^(8)ms^(-1))/(750xx10^(9)m)=4.00xx10^(14)Hz`
The range of visible spectrum is from
`4.0xx10^(14)` to `7.5xx10^(14)Hz` in terms to fre quency units.
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