A certain metal when irradiated to light (v = 3.2 × 10¹⁶ Hz) ) emits photoelectrons with kinetic energy double to the of kinetic energy of photoelectrons which was emitted by the same metal when irradiated by light (v = 2.0 × 10¹⁶ Hz). The V₀ (threshold frequency) of metal is :
A. 1.22 × 10¹⁴ Hz
B. 8 × 10¹⁵ Hz
C. 1.2 × 10¹⁶ Hz
D. 4 × 10¹² Hz