16. Determination of h using LEDs
- 00:50 Rearrange the equation to show that h equals 5.333 x 10-28 divided by the gradient of the graph.
variable d.c. power supply
1 kΩ protective resistor
voltmeter (resolution ± 0.01V) [multimeter set to appropriate range]
various LEDs – with known wavelengths
Heat – the components will get hot if the power is left on.
Students should wear eye protection and should only connect the power when taking measurements.