3b-scientific Determination of Planck's Constant (h) Appara User Manual download pdf

3B SCIENTIFIC

PHYSICS

Light emitting diodes for determining Planck’s constant (h)

8482460

Instruction sheet

07/06 SP

1 Sockets for LED’s (anode)

2 LEDs, blue to infrared

3 Socket for 100 series resistor

4 Series resistor on (rear of) cir-

cuit board 100

5 Socket for common cathode

1. Safety instructions

• When the diodes are brightly illuminated, avoid

looking directly at the radiating surface.

• Do not exceed the maximum current.

• Do not operate the diodes without the series

resistor.

• Do not allow any liquid to enter the equipment.

2. Description

The equipment is used to determine Planck’s constant

h by measuring the diffusion voltage of multicoloured

LEDs as a function of wavelength or frequency. It is

also possible to determine wavelengths by means of

lattice diffraction, as well as the relation between

luminous intensity and current. In addition, the

equipment can also be used to determine the cur-

rent/voltage characteristic curves for the LEDs. The

circuit board is equipped with six LEDs in the colours

blue, green, yellow, and three different wavelengths

of red. The cathodes are lall connected to a common

rail. The resistor serves as a protection and should

always be connected in series when operating the

diodes.

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3B SCIENTIFIC® PHYSICS 1 Light emitting diodes for determining Planck’s constant (h) 8482460 Instruction sheet 07/06 SP 1 Sockets for LE

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Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com 3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany

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3b-scientific Determination of Planck's Constant (h) Appara User Manual