What is the 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 for work function of a metal?
Thus work function of the metal ϕ=E−K=1.
What is work function in photoelectric effect formula?
The Formula for Photoelectric Effect Work function. E. The maximum possible kinetic energy of the emitted electron. It will be \frac{1}{2} mv^{2}, for mass m and velocity v of the electron.
What is the work function in eV of the metal?
Work Functions for Photoelectric Effect
| Element | Work Function(eV) |
|---|---|
| Silver | 4.26-4.73* |
| Sodium | 2.28, 2.36** |
| Uranium | 3.6 |
| Zinc | 4.3 |
What is meant by work function of a metal How does the value?
Work Function : The minimum energy required to free an electron from metallic surface is called the work function. Smaller the work function, larger the kinetic energy of emitted electron.
What is meant by work function of a metal How does the value of work function influence the kinetic energy?
Answer: Threshold energy is equal to the work function of the element. Hence work function= Energy of photon – Kinetic energy of the metal. So as the work function of metal increases the kinetic energy of the emitted photo electron decreases.
What is the equation of work function answer?
hυ=W+E, where h= Planck’s constant, υ=frequency of the incident photon, W= work function, E=maximum possible kinetic energy.
How do you calculate work function using a photoelectric cell?
Given: Wavelength of radiation = λ = 3000 Å = 3000 x 10-10 m, work function = Φ = 1.6 eV = 1.6 x 1.6 x 10-19 J = 2.56 x 10-19 J, speed of light = c = 3 x 108 m/s, Planck’s constant = h = 6.63 x 10-34 Js, Charge on electron = e = 1.6 x 10-19 C. To Find: Stopping potential = Vs =?
Is work function in eV or J?
The work function is the minimum energy (usually measured in electron volts) needed to remove an electron from a solid to a point immediately outside the solid surface (or energy needed to move an electron from the Fermi energy level into vacuum).
What is meant by the work function of a metal How does the value of work function influence the kinetic energy of electrons liberated during photoelectron?
What is the work function () of a material *?
Work function is a property of a material, which is defined as the minimum quantity of energy which is required to remove an electron to infinity from the surface of a given solid.
What is work function Formula 11?
Is work function for photoelectric effect is different for different metals?
Therefore, option (A) is the correct answer; the work function for photoelectric effect is different for different metals. Note: Work function depends upon the structure and chemical composition of a surface.
Does work function depend on metal?
EXPLANATION: Work function solely depends on the material of the metal used. Different metals have electrons present at different energy levels, depending on which the work function varies.
What is work function equation?
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.
Is work function different for all metals?
Different metals have different values of work function because of difference in their electronegativity. The least electronegative (or most electropositive) metal would let go of its valence electron very easily compared to those metals with higher values of electronegativity.
What is the photoelectric effect Formula?
If E > Φ, the photoelectric effect will take place along with possession of the kinetic energy by the ejected electron. Photoelectric Effect Formula. 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. Where,
What are the elements used in photoelectric effect?
Work Functions for Photoelectric Effect\r Element Work Function(eV) Aluminum 4.08 Beryllium 5.0 Cadmium 4.07 Calcium 2.9 Carbon 4.81 Cesium 2.1 Cobalt
Is the photoelectric effect constant for a specific metal?
It is constant for a specific metal but may be different for different metals. If γ = frequency of incident photon and γth= threshold frequency, then, If γ < γTh, there will be no ejection of photoelectron and, therefore, no photoelectric effect.
What is the photoelectric effect if Γ = γth?
If γ = frequency of incident photon and γth= threshold frequency, then, If γ < γTh, there will be no ejection of photoelectron and, therefore, no photoelectric effect. If γ = γTh, photoelectrons are just ejected from the metal surface, in this case, the kinetic energy of the electron is zero