Using the graph shown, what does the intercept on the frequency axis represent in the $K_{\max}$ versus $\nu$ plot? 
AStopping potential
BSaturation current
CThreshold frequency
DWork function in joules
Answer & Solution
Correct answer: C. Threshold frequency
In the linear relation $K_{\max}=h(\nu-\nu_0)$, the kinetic energy becomes zero at $\nu=\nu_0$. Therefore the intercept on the frequency axis in the $K_{\max}$ versus $\nu$ graph represents the threshold frequency.
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