Question

What condition must be met for photoelectric emission to occur?

Options

• \[h\nu\geq K_{\max}\] only

• \[h\nu\geq\phi_0\]

• \[\phi_0=K_{\max}\] only

• \[h\nu<\phi_0\]

Answer 1

Photoelectric emission requires \[h\nu\geq\phi_0\]. The photon must have at least the minimum energy needed to remove an electron.