What is the relation between intensity and photoelectric current?
In the End For a given metal (photosensitive material), the photoelectric current is directly proportional to the intensity of the light used, above a minimum value of frequency called the threshold frequency. The saturation current depends on the intensity for a known value of frequency.
How is the nature of graph for photoelectric current vs intensity?
A graph between intensity of light and photoelectric current is found to be a straight line indicating that the photoelectric current is directly proportional to the intensity of incident radiation.
Does photoelectric current increase with intensity?
(c) Maximum kinetic energy of the photo-electrons is independent of the intensity of incident radiation. Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation.
What is the relationship between the intensity and the current?
This current is the number of electrons being emitted per second. That is directly proportional to the intensity of the light. So greater intensity means more photons striking the surface and hence an increase in the emitted electrons.
Why is photoelectric current proportional to intensity?
It’s because intensity is directlyproportional to number of photon in light ray and in photoelectric effect one photon can only release one electron and so more intense light means more photon hence more elections will ejected from the metal surface and hence increasing the photo current .
What is the formula of photoelectric current?
equations
| E = hf = | hc |
|---|---|
| λ |
How photoelectric current varies with intensity of light?
The threshold frequency varies from matter to matter. Number of Photoelectrons: The increase in intensity of light increases the number of photoelectrons, provided the frequency is greater than threshold frequency. In short, the number of photoelectrons increases the photoelectric current.
What is the effect of intensity and potential on photoelectric current?
For a fixed frequency, the photoelectric current increases linearly with increase in intensity of incident light. When –ve potential is applied to the plate A w.r.t. C, photoelectric current becomes zero at a particular value of –ve potential called stopping potential or cut-off potential.
Does current increase with intensity?
As long as no nonlinearities are introduced, the relative charge yield of #electrons/photon remains constant and therefore the current increases with light intensity.
Why does current increase with intensity?
As the number of photons increase(i.e the intensity increases) the number of electrons increases hence the current increases since I=ne.
What is the difference between intensity and current?
The electrical current is a physical phenomenon caused by the displacement of electrons or ions that induce electric fields. By convention, current is considered to be a flux of positive charges. The intensity of the current is the quantity of charge which passes in a conductor per unit of time.
Does photoelectric current depends on light intensity?
The photoelectric current depends only on wavelength of light.
How is the photoelectric effect an instantaneous phenomenon?
The Photoelectric effect is an instantaneous phenomenon. There is no time delay between the incidence of light and emission of photoelectrons. The number of photoelectrons emitted is proportional to the intensity of incident light. Also, the energy of emitted photoelectrons is independent of the intensity of incident light.
How are photoelectric current and intensity of incident radiation related?
It shows that photoelectric current and intensity of incident radiation both are proportional to each other. The photoelectric current gives an account of the number of photoelectrons ejected per sec. The frequency of incident light and intensity is kept constant and the potential difference between the plates is varied:
When does the photoelectric current increase there is no change?
There is no change in photoelectric current when potential increased higher than the characteristic value for any increase in the accelerating voltage. This maximum value of the current is called as saturation current. Effect of Frequency on Photoelectric Effect The intensity of light is kept constant and the frequency of light is varied:
How does the threshold frequency affect the photoelectric effect?
The threshold frequency varies with material, it is different for different materials. The photoelectric current is directly proportional to the light intensity. The kinetic energy of the photoelectrons is directly proportional to the light frequency. The stopping potential is directly proportional to the frequency and the process is instantaneous.