- #1
broegger
- 257
- 0
Simple question: What happens to the energy of a photon that does not succeed in knocking off an electron??
Last edited:
broegger said:Simple question: What happens to the energy of a photon that does not succeed in knocking off an electron??
saltrock said:What does it mean by saying photons are absorbed by electrons.after absorbing the photons whereabouts in or on the electrons does the photon actually go?Also electrons are knocked off by photons,how does it prove that light is a particle?
saltrock said:Right,that means photons are absorbed by the whole atom.Since photon is a particle,when it is absorbed by the atom where does it go.say,when glucose is broken down in the stomach,it is absorbed by the cells of our body.Absorbtion here means that glucose molecule gets into the cytoplasm through the cell membrane and remains there.Likewise when photons are absorbed by atom,where does that photon go?Does this mean the mass of the atom will be higher because photons have been absorbed.I am just confused by the term"absorbtion"What actually mean by saying this?sorry if i sounded bit crazy!
Cheman said:Surely, couldn't an electron be hit by several photons in a given period of time and thus build up enough energy to escape even if the "light" is of low frequency? (eg - infra red)
Also, into what form of energy does the kinetic energy that is lost as a result of the work function become?
Thanks.
Cheman said:Surely, couldn't an electron be hit by several photons in a given period of time and thus build up enough energy to escape even if the "light" is of low frequency? (eg - infra red)
Also, into what form of energy does the kinetic energy that is lost as a result of the work function become?
Thanks.
$id said:Ill quote einsteins photoelectric equation
the maximum kinetic energy of the escaped electron = h*f + Work function
The work function is the minimum energy needed to remove the electron from the atom. So i presume its ionisation energy of that atom?
correct me if I am wrong.
The photoelectric effect is a phenomenon where electrons are emitted from a metal surface when light is shone on it. This was first observed by Heinrich Hertz in 1887 and later explained by Albert Einstein in 1905.
When light of a certain frequency (or energy) is shone on a metal surface, it can transfer enough energy to the electrons in the metal to overcome the attractive forces of the metal atoms and escape the surface, resulting in a flow of electrons known as a photoelectric current.
A photon is a fundamental particle of light that behaves both as a wave and a particle. Its energy is directly proportional to its frequency, and can be calculated using the formula E = hf, where E is energy, h is Planck's constant (6.626 x 10^-34 J*s) and f is frequency.
The energy of a photon must be greater than the work function of the metal (the minimum energy required to remove an electron from the metal surface) in order to cause the photoelectric effect. If the energy of the photon is not sufficient, no electrons will be emitted.
The photoelectric effect has many practical applications, such as in solar panels, where it is used to convert light energy into electrical energy. It is also used in photodiodes, which are used in cameras and other light-detecting devices. In addition, the photoelectric effect is used in photocells to control the operation of streetlights and automatic doors.