A Metal Having a Work Function of 2

Multiple Choice

A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19 J)

A) 6.8 × 10¹⁴ Hz
B) 2.7 × 10¹⁴ Hz
C) 7.6 × 10¹⁴ Hz
D) 8.5 × 10¹⁴ Hz
E) 9.4 × 10¹⁴ Hz