Determining plancks constant

(10) The results shown in the table below were obtained in an experiment to
estimate the Planck's constant (h).

(a) Use the relationship eV =
hc

to calculate a value for the Planck's constant, h

for each LED and hence obtain an average value for h.
(b) Complete the table of results by calculating 1/lambda for each LED and plot a
graph of V against 1/lambda and use the graph to obtain a value for h.

Wavelength column looks a bit ropey... Should be more like 560 nm for green light.

What exactly do you need help with? What have you managed so far?

I answered the full questions but the answers seem so far away from planks they couldn't be right
a) 3.4x10^-38
b)6.4 x10^-33

i feel like the table is wrong

Other than the fact that they've definitely missed out a factor of 10^-7 in the wavelength column, I don't see how you could be getting something around 3.4 for the Planck constant - they were all between 6 and 7 when I calculated the values.
Wait, did you think the eV on the left meant 1 electronvolt?

i think I calculated the EV wrong i used EV = 1/2mv^2

ahh...

eV means electron charge * potential difference, so the formula rearranged for $h$ is $h = \dfrac{e \times V \times \lambda}{c}$