## Chemistry (4th Edition)

λ=$\frac{hc}{E}$ , where h is the Planck's constant, c is the speed of light and E the energy of one photon. i.e. λ= $\frac{6.626\times10^{-34}Js\times3.00\times10^{8}ms^{-1}}{1.32\times10^{-23}J}$ = 1.51 cm.