Table of Contents
- 1 Why all the photoelectrons do not have the same energy?
- 2 Why Photo electrons ejected from a metal surface have different kinetic energies Although the frequency of incident photons are same?
- 3 Why do all electrons emitted in beta decay do not have the same energy?
- 4 Why do emitted electrons have a range of kinetic energies?
- 5 Why do beta particles emit electrons?
- 6 What increases the kinetic energy of an electron ejected from a metal surface?
- 7 Why can only some photons eject electrons?
- 8 What causes photo-electrons to be emitted when electromagnetic radiation is emitted?
Why all the photoelectrons do not have the same energy?
All photo electrons are not emitted with the same energy as the incident photons. When the photon hits the atom some of the energy of the photon is used to overcome the attraction force and remaining energy is converted into the kinetic energy of the emitted photoelectron.
Why all the photoelectrons emitted from the metal surface have different kinetic energies?
The two factors affecting maximum kinetic energy of photoelectrons are the frequency of the incident radiation and the material on the surface. As shown in the graph below, electron energy increases with frequency in a simple linear manner above the threshold.
Why Photo electrons ejected from a metal surface have different kinetic energies Although the frequency of incident photons are same?
Each electron energy possessed by an ejected electron can either be the same or different from the other because when a photon energy is absorbed by an electron, part of the energy is used to overcome the binding energy. The extra energy is the one used to release the electron.
Do all electrons emitted in photoelectric effect have the same kinetic energy?
In the process of photoelectric emission all the emitted photoelectric posses the same kinetic energy.
Why do all electrons emitted in beta decay do not have the same energy?
In β – decay proten remains in the nucleus, but electron and neutrion are emitted with constant energy. The energy of neutrion is not constant. So, all electrons do not have same energy.
Do all electrons ejected from the metal surface have the same kinetic energy?
No, it is not necessary that all the ejected electrons will have the same energy.
Why do emitted electrons have a range of kinetic energies?
Explain why the kinetic energy of the photoelectrons emitted has a range of values up to a certain maximum. The rest of the energy will become kinetic energy of the electron. If the electron is at the surface it will not need as much energy to escape from the metal as one deeper within the structure.
Do all electrons ejected from a metal surface have the same kinetic energy?
Why do beta particles emit electrons?
Beta minus particle (β-) emission occurs when the ratio of neutrons to protons in the nucleus is too high. An excess neutron transforms into a proton and an electron. The proton stays in the nucleus and the electron is ejected energetically.
Why does beta minus decay occur?
Beta decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other. In beta minus decay, a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e – +.
What increases the kinetic energy of an electron ejected from a metal surface?
The kinetic energy of emitted photoelectrons should increase with the light amplitude. The rate of electron emission, which is proportional to the measured electric current, should increase as the light frequency is increased.
Why does maximum kinetic energy of emitted electrons not change?
EACH ELECTRON CAN ABSORB ONLY ONE PHOTON AT ANY ONE TIME. Increasing intensity means more photons (per second, per m2) so results in more electrons emitted (per second) but no change to max KE. Increasing frequency means more energy per photon so higher max KE of electrons but same rate of electron emission.
Why can only some photons eject electrons?
Only those photons can eject electrons which have energy more than or equal to a minimum required energy (threshold energy). Since energy is transferred in a lump, the ejection is instantaneous. According to Classical mechanicsthe energy of light is distributed equally on its wavefront.
What is Einstein’s explanation of the photoelectric effect?
According to the Einstein explanation of the photoelectric effect is: The energy of photon = energy needed to remove an electron + kinetic energy of the emitted electron i.e. hν = W + E
What causes photo-electrons to be emitted when electromagnetic radiation is emitted?
Provided it is above the threshold frequency of the metal, when electromagnetic radiation is shone onto a metals surface photo-electrons are emitted. This occurs because 1 photon is absorbed by 1 Stack Exchange Network
What happens to the electrons when a metal is heated?
When the metal is heated the electrons absorb the heat energy and jump to higher orbits. When they absorb sufficient energy they escape the electrostatic attraction of the nucleus and become free electrons. These free electrons are emitted from the metal surface.