What is the kinetic energy of an electron with a frequency of 8.3 × 10^{14}Hz? Estimate h as 4.14 × 10^{-15 }eVs.

1.2 eV

3.4 eV

1.2 J

34 J

18 J

We use the equation E = hf. We plug in the values we are given and get

E = (4.14 × 10^{-15}) (8.3 × 10^{14}) = 3.4eV.