Chapter 6 The Structure of Atoms - Study Questions - Page 247d: 63

See the answer below.

$E=h\times\nu$ $1.173\times10^6\times1.6022\times10^{-19}\ J=6.626\times10^{-34}\ J.s\times \nu$ $\nu=2.84\times10^{20}\ 1/s$ $c=\lambda\times\nu$ $2.998\times10^8\ m/s=2.84\times10^{20}\ 1/s\times\lambda$ $\lambda=1.06\times10^{-12}\ m=1.06\ pm$