Talk to a Flinn Scientist or Customer Service Rep1-800-452-1261M-F 7:30am-5pm CT

Photoelectric Effect with Amplifier

Photoelectric Effect with Amplifier AP5768
Catalog Number
Photoelectric Effect with Amplifier
Product Description

Demonstrate what Einstein theorized about back in 1905, and later confirmed-that the energy of an electron ionized by a photon of light depends only on the wavelength of light, and not its intensity. Irradiate the photocathode with a monochromatic light source and a current will be produced when the electrons are "knocked" free of the cathode metal. Use the built-in amplifier to apply an opposing voltage that just stops the flow of electrical current. This stopping voltage is proportional to the energy of the emitted electrons. Plotting the stopping voltage against the reciprocal of the wavelength of light generates a straight line that can be used to calculate Planck's constant. Repeat the demonstration with a higher intensity of light. Students will see first-hand that the brightness of the light has no effect on the energy of the emitted electrons. An important result that paved the way to discoveries in modern physics and a better understanding of the universe. Includes three filters to provide the appropriate monochromatic light sources from an ordinary incandescent or fluorescent lightbulb. A digital voltmeter is required to measure the stopping voltage, but not included.

Multimeter, Student
This economically priced, compact, all-purpose multimeter is perfect for the rigors of student classroom use. Comes complete with battery and test leads. Specifications include: • 3 1/2-digit high-contrast LCD • DC current to 200 mA, fuse protected...
Additional Resources
No Additional Resources at the time.
Flinn Catalog/Reference Manual Page 746
P.O. Box 219, Batavia, IL60510



*Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.