Physics

Problem

Using

h=6.626\times10^{-34}\,\text{J\,s}

c=3.00\times10^{8}\,\text{m/s}

, and

N_A=6.022\times10^{23}\,\text{mol}^{-1}

, calculate the energy per mole (in

\text{kJ}\,\text{mol}^{-1}

) for photons with each of the following wavelengths:

780\,\text{nm}

4.50\,\mu\text{m}

, and

2.80\,\text{cm}

. Then rank these energies from greatest to least.