[单选题]
When light of wavelength 350 nm i wkgt2- 1,qg,gkit. uks incidenmiq)86dy ert31w ;gx et on a metal surface, the stopping potential of the photoelectronwiy d1 tgree8 )6;mq3xs 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. $7.34 \times 10^{14} \; Hz$
