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The binding energy in the photoelectric equation is sometimes called the material's:

AHeat function
BWave function
CMass function
DWork function
Answer & Solution
Correct answer: D. Work function
1. The energy needed to free an electron has a second name. 2. Einstein's 1905 equation explains the photoelectric effect quantitatively. 3. It contains a binding energy term for the material. 4. That binding energy is sometimes called the work function of the material. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 29 'Quantum Physics', sections 29.1-29.8_
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