The attached word document contains the answer to photoelectric effect experiment.
To determine Photoelectric effect theory
To measure different voltages associated with different wavelengths of light
To determine the value of Plank’s constant.
In the year 1887, Hertz discovered that when a light of sufficient frequency is illuminated on a
metallic surface, electricity may be emitted. In 1900 Lenard identified positively the liberated
particles like electrons and their energies. He studied the fraction of the number and energy of
electrons as a function of the wavelength of the incident light and its intensity. The results from
this study were not able to be proved using the wave theory of light.
The phenomenon was not explained until Einstein with the help of Planck’s idea of radiation
comes in small quanta experimented. According to Einstein, the energy of the ejected electrons is
proportional to the energy of the incident light with a constant called work function. As the
intensity of light increases, the energy of the emitted electrons would increase. The photoelectric
effect is the emission of electrons from the surface of the metal when electromagnetic radiation
shines on the metal.
The maximum electrons kinetic energy when they leave a metal surface due to radiation by light
depend on the wavelength of the light and not the intensity of the light. The Einstein suggestions
did not have enough evidence to confirm or disapprove the equations. Millikan comes up with
precise measurements that proved that the theory was true and correct.
Mercury Lamp and Power Supply (in SE-6609)
Photodiode (in SE-6609)
Track (in SE-6609)
DC Current Amplifier (BEM-5004)
DC Power Supply I (BEM-5001)
850 Universal Interface (UI-5000)
1. Mercury lamp and photodiode case mounted on the track
2. Power cord connected to the Mercury Lamp Power Supply from the Mercury Light
Source and the Mercury Lamp Power Supply was connected to an outlet.
3. Mercury Lamp turned on and left for 10 minutes to warm and cover placed.
4. DIN-plug connected to DIN-plug cable between channel A on the 850 interfaces and the
DC Amplifier. DIN-plug connected to DIN-plug cable between channel B on the 850
interfaces and the DC Power Supply port.
5. The Current Ranges switch turned to 10^-13 amperes on the DC Current Amplifier.
Calibration meter was activated and adjusted to read zero amperes.
6. Calibration was put in the out position for measuring.
7. On the DC Power Supply, -4.5 to 0 V range was selected.
8. Cables were connected to the photodiode:
9. BNC-plug was connected to BNC-plug cable between port K on the Photodiode and the
BNC jack ...