What will increase the number of electrons emitted in terms of the photoelectric effect?
Increasing the intensity of the light increases the number of photons in the beam of light and thus increases the number of electrons excited but does not increase the energy that each electron possesses.
What will happen to the photoelectric current flow of electrons if the light intensity increases?
(b) The number of electrons emitted per second (i.e. the electric current) is independent of frequency and increases linearly with the light intensity. Some of the energy in the packet is used to overcome the binding energy of the electron in the metal. This binding energy is called the work function, Φ.
How does the frequency affect the photoelectric current?
Experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons, and increasing the light amplitude increased the current.
What will happen to the photoelectric current when we increase the intensity of photons and energy remains constant?
Decreases because when energy of a photon increases increasing the size of a photon resulting less photons collide per unit time so it decreases. Constant because when the energy increases the size cant increases cos they are discrete particles so same amount of electrons ejected resulting noo change in the current.
How do you calculate photoelectric current?
The intensity multiplied by the Area of the plate results in the total energy that arrives the plate in each second. So IA = E/Δt, where E = nhf (n photons of frequency f) Let’s say each photon is able to pull out one electron from the plate, so the current i = ne/Δt, where e is the charge of the electron.
Does photoelectric current depend on wavelength?
For photoelectric effect to occur, the energy of the photon must be greater than the work function. As the wavelength of the incident light decreases but is lower than the cut-off wavelength, the maximum kinetic energy of the photo electrons increases.
What happens to photoelectric current if the intensity of metal surface increases?
If the frequency of electromagnetic waves is higher than the extraction threshold of the metal and electrons are emitted from the metal surface, then an increase of light intensity will result in a proportional increase of electrical current of the electrical circuit where the emitted electrons are conveyed.
How does photoelectric effect increase current?
If the kinetic energy of electrons increases then their velocity also increases, if their velocity increases then the number of electrons passing an area in 1 second should also increase, i.e. the current should increase.
Why current is constant in photoelectric effect?
When the voltage is increased up to a certain level, every electron that gets released is able to reach the other electrode, but as the number of electrons getting released is constant, current too becomes constant (saturation current) and no further increase in voltage will cause increase in current.
Does photoelectric current depend on intensity?
Yes, the photoelectric current depends on the intensity of incident radiation.
What is meant by photoelectric current?
To be more precise, light incident on the surface of a metal in the photoelectric effect causes electrons to be ejected. The electron ejected due to the photoelectric effect is called a photoelectron and is denoted by e–. The current produced as a result of the ejected electrons is called photoelectric current.
What is the formula of photoelectric effect?
The photoelectric effect is the process in which EM radiation ejects electrons from a material. Einstein proposed photons to be quanta of EM radiation having energy E = hf, where f is the frequency of the radiation.