## Equation units

Emma Randolph 1J
Posts: 65
Joined: Fri Sep 28, 2018 12:29 am

### Equation units

For the photoelectric effect equation, do we need to use kg or g? In most examples I've only seen kg but could you also use grams for determing the energy?

Anusha 1H
Posts: 65
Joined: Fri Sep 28, 2018 12:15 am

### Re: Equation units

I think we're supposed to use kg. If given g, for the photoelectric effect equation in particular, convert to kg first.
This is because when determining values for things like kinetic energy, the units are kgm2s-2, which is equivalent to Joules.

Kailey Nichols 4B
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

### Re: Equation units

We need to use kg because in the photoelectric effect equation: K = E - $\Phi$, Kinetic energy is measured in Joules (J) and one Joule is equal to 1 kgm2/s2

Kyither Min 2K
Posts: 60
Joined: Wed Oct 03, 2018 12:15 am

### Re: Equation units

kg since the measurement of SI unit , Joules, is kgm^2/s^2 so we use kg

Kelly Hollman
Posts: 33
Joined: Fri Sep 28, 2018 12:27 am

### Re: Equation units

I agree, kg is the SI unit for mass.