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The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

Asked in AIEEE 2004 · Threshold frequency and wavelength

Answer: (3) 310 nm

Step-by-step solution

At the threshold the photon energy just equals the work function.

λ₀=(1240 eV nm)/(4.0 eV).

λ₀=310 nm.

Why the other options are wrong

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