Homework Help: Photoelectric Equation - SI unit question

1. Apr 4, 2015

CKaiL

1. The problem statement, all variables and given/known data
I am trying to plot a graph of stopping voltage against frequency

The given equation is eV0 = hf - w0

So i need to change it to the form of y = mx + C in order to plot this graph

V0 = h*f/e - w0/e

V0 = h/e * f - w0/e -- > V0 = y , m(gradient) = h/e , x= f and -w0/e = C (y intercept)

V0 is the stopping voltage , h is Planck constant , e is the electron constant , W0 is the threshold frequency

Now I am confused what SI unit does h/e has and w0/e ?

2. Relevant equations

3. The attempt at a solution

2. Apr 4, 2015

PWiz

$E=hf$. What are the units of $h$?
What are the units of work function energy?

3. Apr 4, 2015

CKaiL

Work function is eV but Planck constant has Js , ev/s

4. Apr 4, 2015

PWiz

But eV is equivalent to J right? Can you represent J in terms of SI units?
EDIT: Remember that the work function energy is also given by an identical equation, $φ=hf_0$, but we instead use the threshold frequency. Numbers play no role in determining the units for an equation.