A Light Beam Is Shining on a Metal Target That

question 73

Multiple Choice

A light beam is shining on a metal target that has a work function of 2.20 eV.If a stopping potential of 1.30 V is required,what is the wavelength of the incoming monochromatic light? (h = 6.63 x 10^-34 J*s,c = 3.00 x 10⁸ m/s,1 eV = 1.60 x 10^-19 J,and 1 nm = 10^-9 m)

• A)355 nm
• B)497 nm
• C)744 nm
• D)1 421 nm

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