In a photoelectric experiment using a clean sodium surface, the maximum energy of the emitted photons was measured for a number of different incident frequencies, with the following results

Plot the graph of theses results and find.
(a) Planck€™s constant;
(b) The cutoff frequency of sodium,
(c) The work functions.

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Energy (eV) Frequency (1014 Hz) 11.8 2.60 10.6 2.11 9.9 1.81 9.1 1.47 8.2 1.10 0.57 6.9