A Photocathode That Has a Work Function of 2

question 44

Multiple Choice

A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV.What is the wavelength of this light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

• A)350 nm
• B)330 nm
• C)300 nm
• D)380 nm
• E)410 nm

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