In the photoelectric effect, it is found that incident photons with energy 5.00ev will produce electrons with a maximum kinetic energy 3.00ev. What is the threshold frequency of this material?

From Literature:

The amount of energy in the photons is given by this equation:

E = hf

where E = energy

h = Planck's constant = 6.63 * 10^-34 Joule seconds

f = frequency of the light, Hz

Given:

E = 3.00 eV and Planck's constant

To solve for the frequency, E = 3.00 eV

1 electronvolt = 1.60218 x 10^-19 Joules

3 * 1.60218 x 10^-19 Joules = 6.63 * 10^-34 Joule seconds * f

f = 7.25 x 10^14 / second or hertz

Therefore, the threshold frequency of the material is 7.25 x 10^14 Hertz.