Units for photoelectric effect

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Rucha Kulkarni 2A
Posts: 43
Joined: Fri Sep 29, 2017 7:05 am

Units for photoelectric effect

Postby Rucha Kulkarni 2A » Sun Oct 08, 2017 11:26 am

Hey, does anyone know all the proper units for the equations in the photoelectric effect?

manasa933
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am

Re: Units for photoelectric effect

Postby manasa933 » Sun Oct 08, 2017 12:24 pm

Plancks constant unit : J s
Frequency: Hertz (Hz)
KE: Joules (J)
Work function: Joules (J)

Chem_Mod
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Re: Units for photoelectric effect

Postby Chem_Mod » Sun Oct 08, 2017 12:30 pm

Hi Rucha,

The "proper units" really depends on what you are solving for. As long as you keep all your units consistent while using the different equations relevant to this unit to solve for the answer you need, the final answer will be fine. Generally, I like to convert all the information I have into standard SI units so I can readily reuse information I previously found from another equation.

The standard SI units for several variables are:
Temperature - Kelvins
Wavelength - meters (In this unit, it will be very common for you to need to convert your final answer to nm)
Energy - Joules
Frequency - Hertz
Speed - m/s
Mass - kilograms
Length - meters

If you have the chemical principles textbook by Atkins, Section 1.4 to the end of Chapter 1 is a good reference to the equations and units associated with each term, especially the examples.


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