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Determination of Planck’s constant

Determination of Planck’s constant

LP9.2.6.1C

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Description

In this experiment, students use LEDs of different colours to determine an approximate value for Planck’s constant h. To do this, they measure the threshold voltage at which each LED begins to glow and, using the corresponding wavelength λ or frequency ν, calculate the value for h in each case and then take the average. In doing so, they explore fundamental concepts of quantum physics, in particular the relationship between photon energy E_Ph and frequency ν according to E = h ⋅ ν.

Components of equipment sets

1	524005W2	Mobile-CASSY 2 WiFi
1	521488	AC/DC power supply 0...12 V/3 A
1	46082 8	Precision metal rail, 50 cm
2	46095 4	Clamp rider
2	45933 4	Diaphragm and slide holder on rod
1	459081	LED board UV
1	459082	LED board blue
1	459083	LED board green
1	459084	LED board red
1	524444 8	Lux Sensor M
1	459089	Diffused light tube for LED boards
1	459088	USB/4 mm cable Planck constant
1	459096 4	Cable USB (USB Type A - Mini-USB)
1	500624 4	Safety experiment cable, 50 cm, black
1	500622 4	Safety experiment cable, 50 cm, blue

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Determination of Planck’s constant

Description

Components of equipment sets

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