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Dartmouth

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Planck's Constant

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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

Apparatus

Notes


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