First slide

Photo Electric Effect

Question

For the photo electric effect, the maximum kinetic energy $E_{K}$ of the emitted photo electrons is plotted against the frequency $ν$ of the incident photons as shown in the figure. The slope of the graph gives

Moderate

A

charge of the electron
B

work function of the metal
C

plank's constant
D

ratio of the plank's constant to the electronic charge

Solution

$h ν = ϕ + E_{K} \Rightarrow E_{K} = h ν - ϕ$
Therefore (3) is the correct option.

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