What is work function of a metal in photoelectric effect?
What is work function of a metal in photoelectric effect?
The emitted electrons can be stopped by applying a potential of 1.2 V.
What is the formula of photoelectric work function?
In his explanation of the photoelectric effect, Einstein defined a quantized unit or quantum of EM energy, which we now call a photon, with an energy proportional to the frequency of EM radiation. In equation form, the photon energyis E = hf, where E is the energy of a photon of frequency f and h is Planck’s constant.
How does work function affect photoelectric effect?
The explanation for the photoelectric effect goes like this: it takes a certain energy to eject an electron from a metal surface. This energy is known as the work function (W), which depends on the metal. A photon with an energy less than the work function will never be able to eject electrons.
What is the work function of a metal mean?
The work function is the minimum amount of energy (per photon) needed to eject an electron from the surface of a metal.
What is work function in photoelectric effect class 11?
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 Einstein’s photoelectric equation 12?
Einstein’s photoelectric equation is given as, The energy of the incident photon is equal to the sum of the maximum kinetic energy of an electron and the work function.
What is the formula for calculating work function?
We can relate the work function, 𝑊 , and maximum electron energy, 𝐸 m a x , given wavelength, 𝜆 , using the formula 𝐸 = ℎ 𝑐 𝜆 − 𝑊 m a x , where ℎ is the Planck constant and 𝑐 is the speed of light.
How is work function calculated?
In mathematical terms, ϕ=hf−K, where ϕ is the work function and K is the kinetic energy of the electron. Thus the work function has been calculated without having to know the threshold frequency.
