PURPOSE: Show how sunspots are darker than their surroundings due to lower temperatures.
DESCRIPTION: Three light bulbs are mounted along a rod: two 150 watt bulbs with a 10 watt bulb between them. The lower-power center bulb appears darker, compared to the two brighter bulbs, because it has a lower temperature.
Sunspots appear darker than the surrounding area becauses they are regions of lower temperature.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: Two 150 watt soft white bulbs and one 10 watt bulb mounted with sockets and switches on lamp bar, tripod.
SETUP TIME: 5 min.
Go back to Lecture-Demonstration Home Page.