When a certain metal was irradiated with light of frequency $4.0 \times 10^{16} \ s^{-1}$,the photoelectrons emitted had four times the kinetic energy as the kinetic energy of photoelectrons emitted when the same metal was irradiated with light of frequency $2.0 \times 10^{16} \ s^{-1}$. The threshold frequency $(v_0)$ of the metal in $s^{-1}$ is
- A$2 \times 10^{16}$
- B$4 \times 10^{16}$
- C$2.5 \times 10^{16}$
- D$1.33 \times 10^{16}$
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