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Photoelectric effect

bubblegum21

How would you calculate the work function given wavelength and maximum velocity?

Reply 1

Stonebridge

Original post by bubblegum21

How would you calculate the work function given wavelength and maximum velocity?

Use the Einstein photoelectric formula.
Do you know it?

You need values for the mass of the electron and speed of light from your data sheet.

(edited 9 years ago)

Reply 2

Patrick2810

Can I also ask, with the equations like E=hf, how do you know when the unit is Joules and when it is eV?

Reply 3

Ekemini

Original post by bubblegum21

How would you calculate the work function given wavelength and maximum velocity?

E=hc/wavelength

Reply 4

Stonebridge

Original post by Patrick2810

Can I also ask, with the equations like E=hf, how do you know when the unit is Joules and when it is eV?

E will be in joule in that equation.
If you are given E in eV then convert it to joule before putting it in the formula.

Reply 5

Random1357

Original post by Patrick2810

Can I also ask, with the equations like E=hf, how do you know when the unit is Joules and when it is eV?

The units are ALWAYS SI Base units, e.g kg, m,s

Or combinations of them e.g. N=kgms^-2
J=kgm^2s^-2

NEVER any others such as eV.

To check dimensional analysis is crucial.

Occasionally an equation has been modified for use in grams etc and these should be learned or derived from. The proper ones.

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