photoelectric effect graph (1 Viewer)

[clever angel]

hi everyone can ne do this question for me plzzzz


Wavelength(nm) 253.6 313.2 365 404.7
Frequency(Hz) 1.18 .958 0.822 0.741
Voltage (volts) 1.95 0.98 0.50 0.14

graph stopping volatge against frequency and use the slope of the graph to fing planks constant. plzzzzzz don;t draw a sketch , i wud be grtt if u can do on graph paper, plzzzz

i did it but my graph is not a straight line

 

[rama_v]

Here, I did it in excel. I dont know if its of any use...