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AP Physics Lab 24: Planck's Constant (CENCO) |
Introducing the new Cenco AP Physics lab series. Ideal for for AP, B and C, IB, and advanced honors physics courses, each of the 24 experiments is aligned with the College Board AP Curriculum.
The teacher guides and student manuals that accompany each lab are authored by an experienced AP Physics teacher, so you can trust the setups to be successful in your classroom. Lead students through these hands-on labs using the outlined guided-inquiry approach.
All labs come complete with instructions and materials for up to six students per lab group.
For your convenience, labs are packaged to allow you to purchase only what is required for each experiment.
Students will measure the wavelength and threshold voltage of an LED and then use these values to calculate PlanckŐÍs constant. How an LED works and how it can determine Planck's constant is also demonstrated. The main apparatus has seven LEDs that are powered up separately with a 9V power supply and a potentiometer. Students adjust the reistance until the current reads zero then measure the voltage across the LED. Using the different stopping potentials and the wavelength of each LED, students can plot a graph from which PlanckÍs constant can be determined.
The kit includes a Planck's constant apparatus, wires, diffraction grating and two multimeters. Required but not included is a 9 V DC power supply or a 9V battery.
*AP and the Advanced Placement Program are registered trademarks of the College Entrance Examination Board, which was not involved in the production of and does not endorse these products.
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- Monday, May 09, 2011 easy to burn out LEDs Reviewed By: Tom (Northfield, MN) This works great and has all the necessary functions and connections to measure Planck's constant. It is easy though to burn out the LEDs due to 'operator error'. Replacing them is possible but takes a bit of soldering skill.
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