Concepts Of Physics MCQ Edition [Volume 2]PhysicsPhotoelectric Effect and Wave–Particle Duality

A photoelectric material has a work function of 4.0 eV . Determine its threshold wavelength.

Options

A414 nm
B155 nm
C310 nm
D620 nm

Correct answer

C. 310 nm

Step-by-step solution

The work function and threshold wavelength ₀ are related by the equation: = hc ₀ Given = 4.0 eV and using the standard value hc 1240 eV nm , we get: ₀ = 1240 eV nm 4.0 eV ₀ = 310 nm

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