What is the difference between frequency and threshold frequency?
The energy of a photon is related to its’ frequency. The minimum energy required to produce photo-emission of electrons is called the work function this depends on the type of metal used. The minimum frequency of light required to give the work function energy is called the threshold frequency.
What is work function What is the relation between work function and threshold frequency of a metal?
Work function of a metal is the minimum energy required by an electron to just escape from the metal surface so as to overcome the restraning forces at the surface. The relation between work function (ϕ0) and threshold frequency(v0)isϕ0=hv0, where h is Plank’s constant.
Is work function small for heavy metals?
The work function tends to be smaller for metals with an open lattice, and larger for metals in which the atoms are closely packed. It is somewhat higher on dense crystal faces than open crystal faces, also depending on surface reconstructions for the given crystal face.
Does the work function depends on the cathode metal?
The work function is important in applications involving electron emission from metals, as in photoelectric devices and cathode-ray tubes. The value of the work function for a particular material varies slightly depending upon the process of emission.
What is the work function for a metal?
The work function (WF) of a metal can be defined as the minimum energy required to extract one electron from a metal. Obviously the WF is one of the fundamental electronic properties of bare and coated metallic surfaces.
What is the frequency when a metal is exposed to photons?
When a metal was exposed to photons at a frequency of 4.68× 1015 s–1, electrons were emitted with a maximum kinetic energy of 5.70× 10–19 J.
How many electrons will be ejected?
Each packet or photon could cause one electron to be ejected, which is like having a moving particle collide with and transfer energy to a stationary particle.