Measuring the Planck's constant with Arduino

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With this shield produced by Steplb it's easy to study the Planck's constant using a normal Arduino Board. The method is based on studying the led threshold voltage. We provide 4 different leds with given wavelength.

This shield makes the experiment repeatable and prevents students from damaging the components. The shield comes with a user manual. Using the Arduino board allows you to make measurements with a computer.

 

Contact us for details

 

 

 

 

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What will you Learn

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Content

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Theory of operation

 

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Light-emitting diodes (LEDs) convert electrical energy into light energy. They emit radiation (photons) of visible wavelengths when they are forward biased. This is caused by electrons from the `N' region in the LED giving up light as they fall into holes in the `P' region. The graph above shows the current-voltage curve (IV curve) for a typical LED. The 'turn-on' voltage Ut is about the same as the energy lost by an electron as it falls from the N to the P region. In this experiment you will find the point at which the light `goes on' by gradually adjusting the voltage.

The energy produced by photons (hc/λ), is assumed to be equal to that lost by each electron, qV: where q is the charge on an electron (q = e = 1.6 x 10^-19 C), U is the turn-on voltage, λ is the wavelength of light emitted in metres, and c is speed of light c = 3.0 X10^8 m/s.

Above you can also see calculation for the measurement error. LED manufacturers state the wavelength of the LEDs with the precision about Δλ = 20nm - 30nm and the precision of my voltmeter is ΔU = 0.01V.

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How to charge Ni-Mh and NiCd batteries

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Our Customers

We sell our products mainly in EU, but we can ship worldwide.  Below you find a map of customers locations. We inserted only the city not address or names

Our components are ideal for small automation, lab automations,  protototypes.

If you have a valid  EU VAT number ,  VAT and taxes are removed automatically.

We sell components and products for educational purpose to schools and institutions. We can also make custom kits based con customer requirements.

We sell also to private persons. If you want to build your own idea, you can find a lot of solutions and examples in our examples page.

Siamo presenti sul MEPA  e possiamo fornire rapidamente materiale a Centri Ricerca, Scuole, Università

I nostri prodotti e servizi sono disponibili per privati, aziende, scuole, enti di ricerca, hobbisti, modellisti, inventori, studenti. Non importa se il tuo progetto è piccolo o grande.

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