[单选题]
When light of wavelength 350 nm is incidptyyfhh.q ne6*,m5p vx23e/ dent on a metal surface, p 8itzf 3wlvyk 1ln9/7the stopping potential of the photoelectrons is 0.500 eVp7z9 k8w1ltvf3nyl i/. 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. $7.34 \times 10^{14} \; Hz$
