3. i4 points My Notes Ask Your Teacher The figure below shows photoelectric effe

Question

3. i4 points My Notes Ask Your Teacher The figure below shows photoelectric effect data for three different metals. The vertical axis is the maximum kinetic energy of a photoelectron (this is the kinetic energy of the is just emitted from the cathode horizontal and the axis is the frequency of the incident light. electron when i (a) The horizontal (frequency)-axis intercepts (when the maximum KE s zero) represent the cutoff (or threshold) wavelengths of the metals O he work functions of the metals Planck's constant o the cutoff (or threshold) frequencies of the metals (b) The units for the slopes of these lines is JVs

Explanation / Answer

(A) when graph intercepts at X-axis then at that frequency electron just come out from the metal and their KE is zero. So this is called cutoff or threshold frequency of metals.

(B) Y-axis represent the KE (unit Joule) and X-axis represents frequency (Unit Hz or 1/s)

so slope Y/X represents the unit of J/(1/s) = J.sec

(C) KE = h.f where h = slope plank's contant

(D) it represents the work function of the metal because this is minimum required to remove electron from metal with zero KE.

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