Photons of energy 1.0 × 10$^{–18}$ J are incident on a metal surface and cause the emission of electrons from the metal surface.
Which statement about the emitted electrons is correct?
1 )
They each have a kinetic energy of 1.0 × 10$^{–18}$ J.
2 )
They each have a kinetic energy that is a multiple of 1.0 × 10$^{–18}$ J.
3 )
Their mean kinetic energy is 1.0 × 10$^{–18}$ J.
The kinetic energy of each must be less than 1.0 × 10$^{–18}$ J.
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