Photoelectric effect - schoolphysics
PHOTOELECTRIC EFFECT EXPERIMENT 100
AIM
The aim of this experiment is to determine the value of Planck’s constant h.
YOU WILL NEED
Planck's constant apparatus
Voltmeter (0 – 1 V)
Oscilloscope
Low voltage (12 V) lamp
Set of coloured filters
Leads
WHAT TO DO
Set up the apparatus as shown with the time base on the oscilloscope set to 1ms.
Press the on/off button on the unit and then increase the voltage until the trace is just flattened out. Record this voltage and the wavelength range of the filter. Repeat the procedure for each filter.
CALCULATIONS
Plot a graph of V against 1/f.
Planck’s constant is then given by the equation:
hf = hc/λ =eV h=e x slope of graph
UNDER NO CIRCUMSTANCES CONNECT ANY POWER SUPPLY TO THE P.E. UNIT. DO NOT GET THE LAMP TOO CLOSE TO THE FILTER.
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to oscilloscope
coloured filter
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