The maximum animation needed to remove an electron form potassium metal is 3.70 × 10-19 J.?

If photons of frequency 9.16 × 1014 s-1 are shone on the surface of the metal, what is the kinetic energy (J) of the ejected electrons ?
Answers:
E=hf
E=9.16 × 10^14*6.626068 × 10^-34
E=6.06947829 × 10^-19

6.06947829 × 10-19-3.70 × 10-19=2.36947829x10^-19

2.37x10^-19J

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