Practice portal › Dual Nature of Matter and Radiation › Conceptual and Statement Questions on the Photoelectric Effect
Asked in GSEB Board March 2020 · Conceptual points of the photoelectric effect
Idea: this is field emission -- a very strong electric field at a metal surface can drag the free electrons out.
Thermionic emission uses heat and photoelectric emission uses light; field emission uses the electric field alone.
The field required is enormous: of the order of 10⁸ V m⁻¹ (NCERT; a spark plug works this way).
So the answer is 10⁸ V m⁻¹, which is the same as 10⁶ V cm⁻¹.
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