PhysicsLAB Worksheet
Data Analysis #8

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Chart #8
Formula
y-axis
variable
x-axis
variable
solved
equation
slope

Photoelectric Effect
T2 r3 #1 #2
slope = 4.18 x 10-15
intercept = -4.93
KE represents kinetic energy in eV (1 eV = 1.6 x 10-19 J)
h represents Planck's constant = 4.14 x 10-15 eV·sec = 6.63 x 10-34 J·sec
f represents frequency in Hz
Φ represents the metal's work function in eV
#1 

#2 



According to this data, what is their experimental value for Planck's constant? 

What is the accuracy, or percent error, in this experiment? 

According to this graph, what is the minimum amount of energy needed to release an electron from the metal's surface; that is, what is the metal's work function? 

Use the equation of the line to determine the threshold frequency of light that will allow an electron to escape from this metal's surface with zero kinetic energy. 




 
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