# physics

posted by .

In the photoelectric effect, does brightness or frequency determine the Kinetic energy of the ejected electrons? Which determines the number of the ejected electrons?

• physics -

Brightness also refers to intensity, or # of photons, what determines the kinetic energy of the ejected electrons is frequencey, as each photon releases 1 electron, if the photon has enough energy to overcome the work function, the remaining energy is then transformed into the electrons kinetic energy (conservation of energy). If it was more intense(brighter), more photons would hit the electrons, freeing them from the materials binding energy, also know as work function. This would lead to more electrons released, but not speed or Ek of electrons.
In short, frequencey affects kinetic energy, and brightness affects number of ejected electrons.

## Similar Questions

1. ### Physics

In the photoelectric effect, what determines the kinetic energy of the ejected electrons?
2. ### Physics

In the photoelectric effect, what determines the number of ejected electrons?
3. ### Physics

The greater the work function for a metal, A) the greater the speed of the ejected electron B) the smaller the speed of the ejected electron C) the more electrons are ejected D) the lower the threshold frequency E) none of the above
4. ### Physics

Electrons are ejected from a photoelectric cell with a maximum kinetic energy of 1.20 eV. If the incident light has a wavelength of 410nm, what is the work funtion?
5. ### Physics

The minimum frequency for the photoelectric effect of a zinc plate is 9.7 × 1014 Hz. What will be the kinetic energy of an ejected electron when a photon with a wavelength 200 nm (2.00 × 10 7 m) strikes it?
6. ### Chemistry #13

When a metal was exposed to light at a frequency of 4.26× 1015 s–1, electrons were emitted with a kinetic energy of 4.50× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light …