# Photo electric effect

1. Oct 1, 2016

### INAM KHAN

1. The problem statement, all variables and given/known data
The photo electric effect threshold wavelength of silver is 2762A(angstrum)

2. Relevant equations

Calculate the maximum kinetic energy of electron?
3. The attempt at a solution
since no work function then how can I slove this? Is this be sloved by E=hv-Φ?

2. Oct 1, 2016

### Simon Bridge

What does "photoelectric effect threshold wavelength" mean?

3. Oct 2, 2016

### INAM KHAN

threshold wavelength means minimum wavelength.

4. Oct 2, 2016

### Simon Bridge

begging the question.... minimum wavelength for what?
What does "photoelectric effect minimum wavelength" mean?

What is it about this wavelength that makes it the minimum for this (whatever "this" may be, you havn't said) to happen?

5. Oct 2, 2016

The question do not have enough information to answer the question . we need incident frequency or wavelength of light to calculate the kinetic energy .
Threshold wavelength means the maximum wavelength that should be in incident on the metal so that electron will eject. Threshold frequency is the minimum frequency that should be incident on the metal surface to eject electrons .

6. Oct 2, 2016

### Simon Bridge

@Nikhil faraday : the idea was that the person whose homework it is should answer the question "what does threshold wavelength mean?" etc. Since understanding what that term means is basically what the homework is about, we shouldn't really say directly.
Clearly OP has not written the entire problem in the "problem statement" section of post #1... probably the entire question is not there.
However, the answer can still be expressed as an equation.

@INAM KHAN : can you relate the threshold wavelength to the work function? It should be in your notes - or look up "photoelectric effect".
(Aside: did you write the entire question in post #1)

7. Oct 2, 2016