We see in photoelectric effect by increasing frequency the K.E of photoelectrons increases . If velocity of electrons increases then time will be less then current should increase then why current remains constant.?
Does the photoelectric effect depend on frequency?
In the photoelectric effect, light incident on the surface of a metal causes electrons to be ejected. ... The classical expectation of the photoelectric effect was that the number of emitted electrons would depend upon the frequency , and their kinetic energy should depend upon the intensity of the light wave.
Does photoelectric current depend on frequency?
Photoelectric effect can be explained as: it takes a specific energy to launch an electron from a metal surface. This energy is the work function which relies upon the metal. Electrons can pick up energy by collaborating with photons. ... Current is not dependent on the frequency of photons .
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.
How does photoelectric current change with frequency of light?
Experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons , and increasing the light amplitude increased the current. ... The work function, Φ, is the minimum amount of energy required to induce photoemission of electrons from a specific metal surface.
Why photoelectric current does not depend on frequency?
At the point when intensity of incident photons increases the number of electrons produced from the surface rises because of which there is an increment in current. Current is not dependent on the frequency of photons. Frequency of photons is only related to the kinetic energy. Thus the current remains the same.
Does saturation current depend on frequency?
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 happens to photoelectric current when wavelength is increased?
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 .
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 happens to electrons in the photoelectric effect?
The photoelectric effect is the observation that under certain conditions, light striking a metal surface can cause electrons to be ejected . In the animation, the light increases in energy as it goes from red, to orange to yellow to green and then blue.
Why does current decrease when frequency increases?
We can see that, When frequency was 50Hz, then the circuit current were 89.20 A, But when circuit frequency increased from 50Hz to 60Hz, then the current decreased from 89.20 A to 75.83 A. Hence proved, In an inductive circuit , when frequency increases, the circuit current decreases and vice versa.
How does photoelectric effect increase current?
The kinetic energy of photoelectrons increases with light frequency . Electric current remains constant as light frequency increases. Electric current increases with light amplitude.
Why does current increase when wavelength decreases?
Current appears to be inversely proportional to the square of the wavelength (Graph 1). This relationship is expected because kinetic energy and wavelength are inversely proportional, and current is a measure of how many electrons have enough energy to travel from the cathode to the anode in a given amount of time.
Which metal is best for photoelectric effect?
Now, photoelectric effect occurs easily if the metal has low ionization potential. So, among the given options, cesium has the lowest ionization potential and hence it is best suitable for photoelectric effect. It is a soft, silvery-gold alkali element that is quickly attacked by air and reacts explosively with water.
Why does energy increase with frequency?
This illustrates the relationship between energy and the amplitude of a wave. The higher the amplitude , the higher the energy. ... The amount of energy they carry is related to their frequency and their amplitude. The higher the frequency, the more energy, and the higher the amplitude, the more energy.
Does saturation current depend on stopping potential?
The saturation current depends on the intensity of the light ,for a given frequency. ... When the increase you increase the frequency you increase stopping potential but the saturation current remains the same for a given intensity.
