Cavity Radiation Experiment - EX-5528A



In this experiment designed for use with PASCO Capstone software, the amounts of thermal radiation from different colored surfaces and a cavity, all at the same temperature, are compared.

An aluminum cube has sides that are black, white, polished aluminum and matte aluminum with a hole. The cube is heated to approximately 90°C and an Infrared Light Sensor is moved across the face with the hole in it to show that the hole emits more infrared radiation than the surrounding surface. A Rotary Motion Sensor on a Linear Translator keeps track of the light sensor's position and the light intensity versus position is plotted. The scan in the visible spectrum is made with a Light Sensor to confirm that the hole is darker than the surrounding surface.

Also, the intensity of radiation from the different colored surfaces is compared.

PASCO Advantage:
The temperature of the cavity is controlled by the 850 Interface and measured using a Thermistor Temperature Sensor, which reads in degrees rather than resistance, eliminating confusion about the resistance decreasing as the temperature increases. The temperature is used to calculate the theoretical wavelength of maximum intensity emitted by the cavity.

In the infrared part of the spectrum, the hot cavity is brighter than the surrounding matte aluminum surface.

Buying Guide


Interface Required

This product requires an 850 Universal Interface for use.

Have specific questions or need more information about the 850? Contact Teacher and Technical Support.  We're here to help!

Software Required

This product requires or recommends PASCO Capstone for data collection and analysis.