Question

State how will you use this graph to detennine the value of Planck's constant.

Answer 1

From the graph the slope , tan θ = `(V_s)/f`

⇒    tan `theta =h/e [∵V_s =h/ef]`

∴            h = Planck's constant = e tan θ 

Thus, knowing the slope we can get the value of 'h' - Planck's constant