An ultraviolet laser with a frequency of 1.2×1015 Hz1.2 \times 10^{15}\text{ Hz}1.2×1015 Hz is used to illuminate a metal plate in a photoelectric cell. The work function of this metal plate is 4.3×10−19 J4.3 \times 10^{-19}\text{ J}4.3×10−19 J.
Which statement is correct?
(Planck's constant h=6.63×10−34 J sh = 6.63 \times 10^{-34}\text{ J s}h=6.63×10−34 J s)
No photoelectrons are released.
Photoelectrons are released with a maximum kinetic energy of 4.3×10−19 J4.3 \times 10^{-19}\text{ J}4.3×10−19 J.
Photoelectrons are released with a maximum kinetic energy of 3.7×10−19 J3.7 \times 10^{-19}\text{ J}3.7×10−19 J.
Photoelectrons are released with a maximum kinetic energy of 8.0×10−19 J8.0 \times 10^{-19}\text{ J}8.0×10−19 J.
