Which element has highest work function?
platinum
Does the work function depends on the incident light?
Depends upon the frequency of incident light. Hint: The different metals consist of different values of work function because of difference in their electronegativity behaviour. 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.
How does work function change with temperature?
The work function can be regarded as a barrier for the electrons to be moved from inside a solid to a point in a vacuum immediately outside the solid surface [17]. Increasing temperature should decrease this potential barrier, since electrons would be thermally excited and easier to be moved as the temperature rises.
Why is the work function negative?
The work function of a photo metal is the minimum energy required to liberate an electron from the metal surface. The negative sign is used to represent the difference between photon energy and work function. The value of the work function is not negative.
How do you find work function?
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.
What is the threshold frequency for cesium?
The threshold frequency of Cs is 9.42×1014 Hz.
What is the threshold frequency of Caesium?
2.14 eV
What’s the work function of cesium?
Work Functions for Photoelectric Effect
| Element | Work Function(eV) |
|---|---|
| Cadmium | 4.07 |
| Calcium | 2.9 |
| Carbon | 4.81 |
| Cesium | 2.1 |
What is the work function of cesium in joules?
The work function for cesium is 19 3.43 10 J.
What is the longest wavelength of light that is capable of ejecting electrons from cesium metal?
400 nm