Light of wavelength 521 nm is incident on a target metal that has a work function of 1.6 eV. What stopping potential is required for this combination in a phototube? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 4.0 V
b. 0.8 V
c. 2.0 V
d. 0.4 V
e. 2.4 V
b
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