What is called work function?
From Wikipedia, the free encyclopedia. In solid-state physics, the work function (sometimes spelled workfunction) is the minimum thermodynamic work (i.e., energy) needed to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.
What is a high work function?
molecules is ionized by supersonic collision on a target surface. High-work-function surfaces. produce positive ions pHSI, and low-work-function surfaces negative ions nHSI. Analytical. merits of HSI include very high sensitivity, atmospheric pressure inlet, and informative mass.
Which metal has work function?
Work Functions for Photoelectric Effect
| Element | Work Function(eV) |
|---|---|
| Platinum | 6.35 |
| Selenium | 5.11 |
| Silver | 4.26-4.73* |
| Sodium | 2.28, 2.36** |
What metal has a work function of 3.7 eV?
magnesium
What metal has a work function of 4.28 eV?
aluminum
Is work function same for all metals?
(B). Is same for all metals. Therefore the work function is that amount of energy which is required to get an electron out of the metal plate without any kinetic energy.
Is threshold frequency is same for all metals?
Different metals have different values of work function because of difference in their electronegativity. Work function is that amount of energy required to get an electron out of the metal plate without any kinetic energy. The frequency of the photon with energy equal to work function is called threshold frequency.
What is work function on what factors Its value depends?
Light above the threshold frequency, even if it’s not very intense, will always cause electrons to be emitted. 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.
Does the work function of a metal depend on intensity of light?
To a first approximation the work function is independant of the intensity of the light, because it’s an intrinsic property of the metal. However in practice there may be very small side effects e.g. if the light heats the metal surface this will reduce the work function very slightly.
Does the work function depends on the incident light and the cathode metal?
Photoelectrons can be ejected from the metal surface only when the incident radiation has a shorter wavelength than the cut-off wavelength. The work function of silver is ϕ=4.73eV (Table 6.3. 1). To make the estimate, we use Equation 6.3….The Work Function.
| Metal | ϕ (eV) |
|---|---|
| Cu | 4.70 |
| Ag | 4.73 |
| Pt | 6.35 |
Does intensity depend on frequency?
If intensity of a wave is proportional to frequency, why doesn’t sound level, in general, depend on frequency. i.e. Higher frequency, higher intensity, higher sound level. The loudness of a sound does not seem to depend on frequency. But according to the equation above, intensity DOES depend on frequency.
Does work function depend on temperature?
The magnitude of the temperature dependence increases with decreasing atomic density of the lattice plane. A strongly nonlinear dependence of the work function is observed for W(100).
How will you determine the stopping potential?
To Find: Stopping potential = Vs =? Given: Initial frequency = ν1 = 2.2 x 1015 Hz, initial stopping potential = Vs1 =6.6 V, Final frequency = ν2 = 4.6 x 1015 Hz, Final stopping potential = Vs2 = 16.5 V, Charge on electron = e = 1.6 x 10-19 C.
What is mean by stopping potential?
Stopping potential or cut-off potential is defined as the required potential for stopping the removal of an electron from a metal surface when the incident light energy is greater than the work potential of the metal on which the incident light is focused.
Which Colour has maximum stopping potential?
Violet
Does stopping potential depends on frequency?
Stopping potential does not depend on the intensity of incident radiation. For a given intensity of radiation, the stopping potential depends on the frequency. Higher the frequency of incident light higher the value of stopping potential.
Does stopping potential depends on nature of emitter?
(d) : The stopping potential depends on frequency of incident light and the nature of the emitter material.
What does the slope of the line between stopping potential and frequency represent?
What does the slope of the line between stopping potential and frequency represent? The slope represents the work function.
Does stopping potential depends on work function?
In photoelectric effect, the stopping potential depends upon the energy of the incident photon and the work function for the metal irradiated (or, equivalently, upon the frequency of the incident radiation and the threshold frequency for metal irradiated).
What is the work function of the cathode?
Shifting the wave length of the incident light and measuring the current through the photocell, one can determine the wavelength of light at which the cathode begins to emit electrons. This maximum wavelength, converted to the corresponding eV value, yields directly the work function.