Chapter 7 - Electronic Structure - Questions and Exercises - Exercises - Page 288: 7.89

Frequency (ν) = $6.08\times10^{14}s^{-1}$ Energy (E) = $4.03\times10^{-19} J$

ν = c/λ c = $2.997925\times10^{8}ms^{-1}$ λ = 493 nm = $493\times10^{-9}m$ ν = $\frac{2.997925\times10^{8}ms^{-1}}{493\times10^{-9}m}$ = $6.08\times10^{14}s^{-1}$ E = hν h = $6.626\times10^{-34}Js$ ν = $6.08\times10^{14}s^{-1}$ E = $6.626\times10^{-34}Js\times6.08\times10^{14}s^{-1}$ = $4.03\times10^{-19}J$