PLANCK’S CONSTANT

Planck’s Constant Apparatus
FIGURE 2—CHARACTERISTIC CURRENT/VOLTAGE CURVE OF THE 6 LED’S
FIGURE 2-CHARACTERISTIC CURRENT/VOLTAGE CURVE
OF THE 6 LED'S
This simple unit enables the student to perform these classical optical experiments. Six LED’s emit light at different wavelengths. As power is supplied to each LED, light will be emitted when the energy difference between two electronic states in a diode is great enough for an electron transition to release one quantum of light at the wavelength of the LED.

A dual trace oscilloscope can be used to display this characteristic curve. Observing the applied voltage at the “knee” of this curve (see figure 3) for several different LED’s Planck’s constant can be determined within 10%.

Required Accessories
0-6 VAC Power Supply
Dual Trace Oscilloscope
TEL 6789 310.00
FIGURE 1—DETERMINE PLANCK’S CONSTANT TO WITHIN 10%
FIGURE 1-DETERMINE PLANCK'S CONSTANT TO WITHIN 10%
FIGURE 3 — PLANCK'S CONSTANT CAN BE DETERMINED FROM THE SLOPE OF THIS CURVE
FIGURE 3 — PLANCK'S CONSTANT CAN BE DETERMINED FROM THE SLOPE OF THIS CURVE. (Base not included)
Led Planck's Constant Apparatus
LED PLANCK'S CONSTANT APPARATUS (Base not included)