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The graph below shows stopping potential plotted against frequency, f.
Physcf4et1p2q14C
From the graph determine:

  1. Planks constant
  2. Work function

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  1. Planks constant. 
    • Slope = h/e = (1.5 - 0)/(8.5-4.5 ×1014 ) 
      h/(1.6 ×10-19 ) = 1.5/(4 ×1014 )
      h = 6.0×10-34Js
  2. Work function 
    • w = hfo
      = 6.0×10-34×4.0×1014
      = 2.4 ×10-19J
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