First slide

Photo Electric Effect

Question

The work function of a photosensitive material is 4.0 eV. The longest wavelength of light that can cause photon emission from the substance is (approximately)

Moderate

Solution

As E $= \frac{12400}{λ}$ (E is in eV and $λ$ is in Å)
$λ = \frac{12400}{4} = 3100 Å ∴ λ = 310 nm$

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