[单选题]
A monochromatic light is in qeyj;bg .e4.tcowc kv..u* -bfident on the surface of a metal with work function 2.50 eV. If a 1.0-V stopping potential is required to make the photocurrent zero, what is the wave*k ucwfbo. -v.length of light?
A. $354 \; nm$
B. $423 \; nm$
C. $497 \; nm$
D. $744 \; nm$
