Photons and the Photoelectric Effect

A photon is

A quantum of electromagnetic energy

Word equation to calculate the energy of a photon

Planck constant x frequency

A photon is

A quantum of electromagnetic energy

Word equation to calculate the energy of a photon

Planck constant x frequency

The electronvolt is defined as

The energy gained by an electron when it is accelerated through a pd of 1V.

The magnitude of an electronvolt in joules is

1.6×10^-19J

The transfer equation is

eV= 1/2mv²

The work function energy is defined as

The minimum energy required to release an electron from the surface of a metal.

Threshold frequency is defined as

The minimum frequency required to release an electron from the surface of a metal.

Einsteins photoelectric effect equation states in words.

Photon energy = work function function energy + maximum kinetic energy of the liberated electron

The quantity conserved in Einstein’s photoelectric equation is

Energy

An experiment that shows the particulate nature of electromagnetic waves is called

The photoelectric effect experiment

For an electron to be released from the surface of a metal the frequency of the incident radiation

must be greater than the threshold frequency for the metal

When an electron on the surface of a metal absorbs a photon with energy above the work function energy

It is released with kinetic energy = photon energy - work function energy

If the wavelength of the incident electromagnetic radiation is increased its frequency is

decreased

If the wavelength of the incident electromagnetic radiation is decreased the photon energy of each photon is

increased

If the intensity of the electromagnetic energy is increased

more photons arrive at the surface but each has the same energy

If the frequency of the electromagnetic energy is increased then the released electron

has more kinetic energy

The number of electrons released by one photon is

one