Question

Calculate (a) Wavenumber and (b) frequency of yellow radiation having wavelength `5800 A^(@)`.

Answer 1

(a) Calculate of wavenumber `(bar(v))`
`lambda = 5800 A^(@) = 5800 xx 10^(-8) cm = 5800 xx 10^(-10)m`
`bar(v) = (1)/(lambda) = (1)/(5800 xx 10^(-10)m) = 1.724 xx 10^(6)m^(-1)`
`= 1.724 xx 10^(4)cm^(-1)`
(b) Calculation of the frequency (V)
`v = (c)/(lambda) = (3 xx 10^(8)ms^(-1))/(5800 xx 10^(-10)m) = 5.172 xx 10^(14)s^(-1)`