A Monochromatic Light Beam Is Incident on the Surface of a Metal

question 31

Multiple Choice

A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV.If a 1.0-V stopping potential is required to make the electron current zero,what is the wavelength of light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

• A)355 nm
• B)423 nm
• C)497 nm
• D)744 nm

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