Answer
326 nm.
Work Step by Step
The photon’s minimum energy is the 3.80 eV bond strength.
$$E=hf=h\frac{c}{\lambda}$$
$$\lambda =\frac{hc}{E}=\frac{1.24\times10^{-6}eV\cdot m}{3.80eV}=3.26\times10^{-7}m$$
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