Determine Planck's Constant from gradient

[ZedCar]

Homework Statement

Determine Planck's Constant from gradient

Homework Equations

The Attempt at a Solution

I have a graph entitled "Photoelectric effect: stopping voltage as a function of light frequency"

The y-axis is the Stopping Voltage (V), the x-axis the Frequency (Hz).

How do I determine Planck's Constant (h) from the gradient?

Thanks!

 

[voko]

What is the kinetic energy of a photo-emitted electron?

 

[Redbelly98]

Homework Equations

Why is your "Relevant equations" section blank? It is a photoelectric effect problem, look up the equation that describes the photoelectric effect.