Increasing the intensity of light incident on a photoelectric material increases the number of photons hitting the material, which in turn increases the rate at which electrons are ejected from the material (photoelectric current). Consequently, higher light intensity leads to a higher photoelectric current.
A semiconductor device that produces electric current through the photo-voltaic effect is a solar cell. When sunlight shines on the cell, it creates an electric current by releasing electrons from the material. This electric current can then be harnessed for various applications, such as generating electricity for homes or powering electronic devices.
When an electric current passes through a special material called a filament, it generates heat due to resistance in the material. This heat causes the filament to glow and emit light. The visible light produced is a result of the electrons in the filament gaining energy and releasing it in the form of photons.
The photo electric effect was explained by Einstein in 1905 when he theorized that light could transfer its energy like a particle and knock electrons out of metals. But the actual effect had been observed by a number of scientists since 1887, they just couldn't come up with a satisfactory theory that explained everything they observed. I believe he got the Nobel Prize for his photo electric effect theory, although he is more famous for his Relativity theories.
The photoelectric effect experiment demonstrated that electrons are emitted from a material when it is exposed to light of a certain frequency, regardless of the light's intensity. This discovery contributed to the development of quantum theory and helped support the idea that light behaves as both a wave and a particle.
Solar panels convert radiant energy from the sun into electricity through a process called the photovoltaic effect, where photons of light excite electrons in the solar cells, generating an electric current.
Photo electrons. So current due to these photo electrons is named as photo electric current.
the current in mosfet is controlled by electric field where as in poto diode is controlled by intensity of light
A semiconductor device that produces electric current through the photo-voltaic effect is a solar cell. When sunlight shines on the cell, it creates an electric current by releasing electrons from the material. This electric current can then be harnessed for various applications, such as generating electricity for homes or powering electronic devices.
The ability of light to cause electron movement and electric current is known as the photoelectric effect. When photons of light strike a material, they can transfer their energy to electrons, causing them to be ejected from the material, which can then result in the generation of an electric current.
The photoelectric current is directly proportional to intensity.It also depends upon frequency, but frequency more than "THRESHOLD FREQUENCY" does not effect the current.The no. of electrons emitted per second by a photo-sensitive surface is directly proportional to the intensity of the incident radiations.So,the photoelectric current depends upon the intensity of the incident radiations.
when photons got enough energy and getting out from that meterial electric current produced from that movement called photo electric.
photo electric effect,compton's effect
photo electric effect,compton's effect
Einstein proposed that light incident on a photo-electric material (indeed, all light), is composed of chunks (he and Max Planck used the term "quanta," the term eventually became "photons"), and that the amount of energy in each chunk was equal to the frequency of the light times Planck's Constant. This explained many puzzling facts about the photo-electric effect, such as (1) why current began to flow almost immediately, even for very low intensity light, (2) why light, no matter how intense, had to be above a certain frequency to get any photo-electric effect, and (3) why higher frequency light resulted in more energetic electrons leaving the material.
Allen Goodrich Shenstone has written: 'The effect of current on the photo-electric sensitivity of metals ..' -- subject(s): Metals, Photoelectricity
The photo-electric effect causes a current to pass between two plates that already have a voltaic potential difference.the photovoltaic effect causes a voltage to grow between two plates that don't already have one (or changes the applied voltage to something else). There is no current.In photo electric effect,When light(photon) Strikes on the one plate,electron in outershell of atom is ejected by absorbing the light.And electron can move from its plate to other plate if energy of photon is satisfy the break force of surface into electron and potential energy of two plates.So current is generated.In photo voltaic effect,When light(photon) Strikes on the one plate, electron in outershell of atom is go up to new energy level by absorbing the light. So no charge carriers move.Therefore no current.
it was for photo electric effect ~_~