First slide

Photoelectric effect and study of photoelectric effect

Question

Monochromatic light incident on a metal surface emits electrons with kinetic energies from zero to 2.6 eV. What is the least energy of the incident photon if the tightly bound electron needs 4.2 eV to remove?

Moderate

A

1.6 eV
B

From 1.6 eV to 6.8 eV
C

6.8 eV
D

More than 6.8 eV

Solution

According to Einstein's equation,
$\begin{array}{l} E = W_{0} + KE \\ W_{0 max} = 4.2 eV \\ KE = 2.6 eV \\ ∴ E_{min} = W_{0 \max} + KE = (4.2 + 2.6) eV = 6.8 eV \end{array}$

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