[单选题]
When light of wavelength 350 nm is incident on a metal s 4m+w ;m avs.1/f u:mfeql8nowurface, )nd6 twj8 e qd/1qhn,rthe stopping potential of th6/)n1 q jwr enq8,hddte photoelectrons is 0.500 eV. What is the threshold frequency?
A. $3.47 \times 10^{14} \; Hz$
B. $3.74 \times 10^{14} \; Hz$
C. $4.73 \times 10^{14} \; Hz$
D. $7.34 \times 10^{14} \; Hz$
