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A Light Beam Is Shining on a Metal Target That

Question 93

Multiple Choice

A light beam is shining on a metal target that has a work function of 1.8 eV.If a stopping potential of 0.7 V is required,what is the wavelength of the incoming monochromatic light? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)


A) 497 nm
B) 166 nm
C) 796 nm
D) 1130 nm
E) ​691 nm

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