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Lascells Planck's Constant
Lascells Planck's Constant
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Price: £94.30
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Stock Update: Only for schools to order
Availability: 2019 Prices held until 2021

Cat. No.: ATQ-305-100
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Modern LEDs (light emitting diodes) cover the range from deep blue to infra-red. By monitoring the voltage at which each LED just begins to emit light a graph of energy input as a function of light emitted frequency can be plotted and an approximate value of Planck's constant deduced. The system is an excellent illustration of modern electronics and gives a good investigation into a difficult topic in Post-16 physics. The LEDs are mounted in a self-contained box with voltage control and monitoring points for current and voltage. A protection resistor is included to prevent damage to the LEDs. Complete with viewing tube but requires a 5V d.c. lab. power supply.

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