Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 29 - Molecules and Solids - General Problems - Page 856: 50

Answer

2.37 eV for green, 2.67 eV for blue.

Work Step by Step

The wavelength of the photon that is emitted has an energy equal to the energy gap. $$E_g=hf=\frac{hc}{\lambda}$$ a. Green light. $$=\frac{(6.63\times10^{-34}J \cdot s)(3.00\times10^8m/s)}{(1.60\times10^{-19}J/eV)(525\times10^{-9}m)}$$ $$=2.37 eV$$ b. Blue light. $$=\frac{(6.63\times10^{-34}J \cdot s)(3.00\times10^8m/s)}{(1.60\times10^{-19}J/eV)(465\times10^{-9}m)}$$ $$=2.67 eV$$
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