Photoelectric Effect and the conversion ofPlank's constant from V.S to J.S

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SUMMARY

The discussion centers on the calculation of Planck's constant using a graph of cut-off voltage versus frequency. The participant calculated a slope of 4.224 x 10-15 V.s and seeks guidance on converting this value to J.s. The conversion involves using the equation eV = change in kinetic energy, where the cut-off voltage represents the maximum kinetic energy of electrons. The correct approach is to ensure that the axes of the graph are appropriately labeled in eV and frequency (s-1), allowing for accurate determination of the gradient's units.

PREREQUISITES
  • Understanding of the photoelectric effect
  • Knowledge of graphing techniques in physics
  • Familiarity with the relationship between voltage and kinetic energy
  • Basic skills in unit conversion and dimensional analysis
NEXT STEPS
  • Learn about the photoelectric effect and its implications in quantum mechanics
  • Study the method of calculating Planck's constant from experimental data
  • Explore the conversion of energy units, specifically eV to Joules
  • Investigate the significance of slope in physics graphs and its dimensional analysis
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Physics students, educators, and researchers interested in experimental physics, particularly those studying the photoelectric effect and quantum mechanics.

Hmpca
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i graphed cut-off voltage verses frequency.
when i figured out plank's constant so when i calculated the slope of the function i got 4.224x10-15. My question is how to convert V.s to J.s for the value of hhereS the question

FINDING A VALUE OF PLANK'S CONSTANT FORM YOUR GRAPH.
calculate the slope of the graph (in V.s)
plank's constant is the slope of a graph of maximum kinetic evergy vs frequency so we need to convert cut-off coltage to maximum kinetic energy. we can use the equation.
eV=change in kinetic energy
because cut-off voltage just stops the most energetic electron.
convert the value of your slope to J.s and compare your value to the accepted value of plank's constant.
 
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If you have plotted KEmax against frequency the units on each axis should be eV (or maybe Joules) and s^-1 (frequency unit)
Can you see what units the gradient of a graph on these axes will be?
 

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