if two metals along with their work functions are potassium 2.3 electron volt and Aluminium 4.3 . identify which line represents each metal give reason for your answer

 Threshold frequency is directly proportional to work function, from the graph metal 1 has lesser threshold frequency thus lesser work function in comparison to metal 2.
Therefore, metal 1 is Potassium and metal 2 is Aluminium as per work function value given.

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