Physics Home > Teaching Labs > Modern Physics > Planck's Constant

Topics

Points of Emphasis

Prerequisites

Lab Activities

An experimental value for Planck's constant, h, is measured by observing the spectrum from a number of different colored LED's. To measure Planck's constant, two pieces of information is needed - the wavelength of the light emitted from the LED and the initial energy of the electron. The wavelength is measured with a spectrometer and the energy of the electron is determined from the I-V characteristics of the diode.

Course Level

Introductory: P19, P24

Student Handouts

Equipment

Number of set-ups available: 20 Per lab station: 5 1 spectrometer / wooden stand 1 diffraction grating 1 cross hair illuminator 2 Fluke multimeters 1 TEK DC power supply 1 diode apparatus 1 lamp banana leads

Notes

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