The energy gap of germanium is 1.28 eV. What is the maximum wave length at which germanium will begin absorbing energy.

Explanation

To find the maximum wavelength at which germanium will begin absorbing energy, we can follow these steps:

### Step 1: Understand the Energy-Wavelength Relationship
The energy (E) of a photon is related to its wavelength (λ) by the equation:
\[ E = \frac{hc}{\lambda} \]
where:
- \( E \) is the energy in joules,
- \( h \) is Planck's constant (\(6.626 \times 10^{-34} \, \text{Js}\)),
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