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.

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