Answer
$5.96\times10^{14}Hz$
Work Step by Step
Wavelength (λ) = 503 nm = $503\times10^{-9}m$
Speed of the radiation (c)= $2.997925\times10^{8}ms^{-1}$
Frequency (ν) = $\frac{c}{λ}$ = $\frac{2.997925\times10^{8}ms^{-1}}{503\times10^{-9}m}$ = $5.96\times10^{14}Hz$
