When light of wavelength 345 nm falls on a potassium surface, electrons are emitted that have a maximum kinetic energy of 1.67 ev. what is the work function of potassium? the speed of light is 3 × 108 m/s and planck’s constant is 6.63 × 10−34 j · s.

Explanation:

The maximum kinetic energy of an ejected electron in the photoelectric effect is given by:

Here h is the Planck's constant, the frequency of the light and W the work function of the element.

The frequency is equal to the speed of light, divided by the wavelength:

Recall that . Replacing (2) in (1) and solving for W:

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

answer(20) psi;