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: 48

Answer

1.1 eV

Work Step by Step

The longest-wavelength photon, in order to be absorbed, should have an energy equal to the gap energy. (If the gap energy were any larger, these photons wouldn’t be absorbed, and the solar cell would be less efficient.) $$E_g=hf=\frac{hc}{\lambda}$$ $$=\frac{(6.63\times10^{-34}J \cdot s)(3.00\times10^8m/s)}{(1.60\times10^{-19}J/eV)(1100\times10^{-9}m)}$$ $$=1.1 eV$$
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