What happens when energy of photon is equal to work function?

If energy of incident photon equals to work function then the ejected photon will have zero kinetic energy because the incident energy of electron will just act as ionising energy.

Which event is likely to take place when a photon of energy equal to the difference in energy between two levels is incident in a system?

If a photon with an energy equal to the energy difference between two levels is incident on an atom, the photon can be absorbed, raising the electron up to the higher level.

When an incident photon is absorbed and an electron is elevated from an energy E1 to an energy state E2 it is known as?

This process is called ‘spontaneous emission’. 6) The interaction of a photon of energy hυ = E2 – E1 with an excited atom forces the excited atom to drop to the lower energy state by emitting a photon of energy hυ = E2 – E1. There are now two photons which are identical in energy, direction , phase and polarization.

What is the relationship between frequency and photon energy?

The amount of energy is directly proportional to the photon’s electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon’s frequency, the higher its energy. Equivalently, the longer the photon’s wavelength, the lower its energy.

Is energy equal to work function?

The work function is the attainable energy needed to detach electrons from the metal surface. So, the maximum energy EK of the photoelectron will be equal to the energy of the incident photon (hf) minus the work function (), because an electron has to do some work to escape the potential from the metallic surface.

What is work function equal to?

In the photoelectric effect, the work function is the energy that must be supplied to overcome the attractive forces that hold an electron in the metal. For mercury, the work function is equal to 435 kJ mol-1of photons.

How does the energy of a photon compare to the difference in energy levels of the atom from which it is emitted?

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

What happens to the energy in a photon when it is absorbed?

If the photon energy is absorbed, the energy from the photon typically manifests itself as heating the matter up. The absorption of light makes an object dark or opaque to the wavelengths or colors of the incoming wave: Wood is opaque to visible light.

What happens to a high energy photon after it strikes an electron?

When an electron is hit by a photon of light, it absorbs the quanta of energy the photon was carrying and moves to a higher energy state. One way of thinking about this higher energy state is to imagine that the electron is now moving faster, (it has just been “hit” by a rapidly moving photon).

What happens to the frequency when the energy of a photon increases?

An increase in frequency produces a proportional decrease in the wavelength of light with a corresponding increase in the energy of the photons that make up the light. Upon entering a new medium (such as glass or water), the speed and wavelength of light is reduced, although the frequency remains unaltered.

What does the energy of a photon depends on?

The energy of a photon depends on radiation frequency; there are photons of all energies from high-energy gamma- and X-rays, through visible light, to low-energy infrared and radio waves.

What happens when a photon hits an electron or atom?

I know once a photon hits an electron it moves from the ground state to an excited state, then come back down to ground by releasing that energy as a photon. But the the electron “and the atom” also increase in kinetic energy or does the energy get released too fast before it has a chance to increase the electron “and atom” kinetic energy?

What is the energy of a photon?

PHOTON ENERGY ELECTRON KINETIC ENERGY BINDING ENERGY OF ELECTRON SOLID VACUUM ω o frequency, ω The Electromagnetic Spectrum SHORTEST WAVELENGTHS (MOST ENERGETIC PHOTONS) According to quantum theory , a photon has an energy given by (Planck’s constant) 10 photons have an energy equal to ten times that of a single photon

Why does the electron have higher energy than the atom?

The electron is located at a higher energy level, the momentum of the photon is transferred to the atom. In the semiclassical Bohr model one can say that the electron has higher energy, though the rigorous quantum mechanical solution is about probable values of the energy if measured.

What is the ground and excited energy of an atom?

An electron bound to a nucleus forms an atom , and usually occupies the ground energy level. If a photon with the appropriate energy hits the atom and it has an energy covering the energy levels of the atom, the system goes to a higher excited energy level.