## units for Equations Sheet

Sjeffrey_1C
Posts: 108
Joined: Wed Feb 20, 2019 12:17 am

### units for Equations Sheet

Could someone give me a quick reminder of the units different things should be in for the constants and equations sheet? Like when to use nm vs m or kg vs g. Just for the most important equations! Thank you!

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

### Re: units for Equations Sheet

Heisenberg's Uncertainty Equation always uses "kg" as the mass and "m" as the x value. The speed of light equation c=v(lambda) always uses meters for the wavelength. Ephoton- threshold energy= kinetic energy. This equation uses Joules/photon as the unit of energy and the mass in kilograms for the kinetic energy. The constants on the equation sheet also has units in them too in case you want to check them.

AArmellini_1I
Posts: 107
Joined: Fri Aug 09, 2019 12:15 am

### Re: units for Equations Sheet

I always like to remind myself of the units for J before doing a calculation because for most, if not all, equations the values you use for mass should be in kilograms, distance should be in meters, and time should be in seconds