Why does current saturate with increasing voltage?
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.
Why does current saturate in photoelectric effect?
The number of electrons emitted per second is fixed. SO, SATURATION CURRENT IS THAT CURRENT WHEN THE RATE OF FLOW OF CHARGE IN THE CIRCUIT BECOMES EQUAL TO THE RATE OF EMISSION OF ELECTRONS .
What happens to the photocurrent when you increase the potential V will it saturate?
when accelerating potential is increased,the photocurrent increases upto a certain level after which it saturates as all the emitted electrons are collected by the collector plate. but when intensity is increased,the current is directly proportional and does not saturate.
What does saturation current depend on?
intensity of light
The saturation current depends on the intensity of light, not on frequency. Hence no matter how much is the frequency for the same intensity of light, the saturation photocurrent will be same.
What is photoelectric saturation current?
It is the maximum current at that time when all the photoelectrons emitted from emitter reach the collector plate. Suitable potential difference is needed.
Why does saturation current not change with increase in anode potential?
At saturation current, all the ejected electrons are directed towards the positive plate. So even if we increase the potential, not too substantially, the current value remains same. EXEPT IF THE POTENTIAL IS TOO HIGH, YOU CAN PULL THE ELECTRONS OUT OF THE METAL.
Why does saturation current mean?
are the carrier lifetimes of holes and electrons, respectively. Since the minority charge carriers in the n-region and p-region are produced by thermally generated electron-hole pairs, these minority charge carriers are extremely temperature dependent and independent of the applied bias voltage. …
Why does saturation current not change with increase the anode potential?
If you increase the frequency of the photon, you increase the electron’s kinetic energy outside the surface. When the increase you increase the frequency you increase stopping potential but the saturation current remains the same for a given intensity.
When electrons hit the anode during photoelectric effect what is produced?
photoelectrons
Electrons that are emitted in this process are called photoelectrons. The experimental setup to study the photoelectric effect is shown schematically in Figure 6.3. 1. The target material serves as the anode, which becomes the emitter of photoelectrons when it is illuminated by monochromatic radiation.
On which factor the magnitude of saturation photoelectric current depends upon?
When the photons have so much energy we can get more photocurrent. If the intensity is high then the photocurrent is high the photocurrent depends on the intensity of light. If the light intensity is fixed for an increasing voltage then the current gets saturated.
How does saturation current varies with anode potential?
(i) Saturation current is same for incident radiations of different frequencies but of same intensity. It does not change with increase in anode potential.
Why the saturation current is independent of the anode potential for incident radiation of different frequencies but same intensity?
(i) In photoelectric emission from a given metal surface, the saturation current depends on the intensity of the incident radiation but is independent of the frequency of the incident radiation. Therefore, for the radiation of diff. intensity, the value of stopping potential will be the same.
What is the effect of saturation current in photoelectric effect?
Saturation current in photoelectric effect. Of photoelectrons that reach the other plate (i.e. the carriers of the current) the no. Of photoelectrons reaching will now be 100 only, and will not increase beacuse of increase in pot. Diff thus current after reaching its saturation value cannot be further increased.
Why current cannot be increased after reaching its saturation value?
Diff thus current after reaching its saturation value cannot be further increased. Regarding the second point, The current flowing depends on the intensity of light. The electrons flow in the area between the plates in almost same speed as in the wire.
Why does the photoelectric current increase with increasing intensity of light?
Keeping the intensity and frequency of light constant, the positive potential of C is increased gradually. Photoelectric current increases when there is a positive increase in the potential between the metal plate and collector up to a characteristic value.
What is the relationship between photocurrent and potential?
Now, in the curve between applied potential and photocurrent measured, on increasing potential, number of electrons reaching cathode per second increases. So naturally, the photocurrent also increases. But apparently, when ” all ” the electrons emitted are able to reach the cathode, the current reaches a saturation. Why?