Name:___________________________________ Year & Sec.:_____________ Score:__________
Teacher:_________________________________ Date:___________________ Rating:_________
Activity 1
Characteristics of Stars
Objectives:
Materials:
2 flashlights (small and big), incandescent light, light dimmer,
Procedure:
Part A. Color
1. Plug the incandescent lamp to a light dimmer switch.
2. Darken the room and turn on the lamp.
3. Adjust the dimmer switch slowly until the bulb becomes dim.
4. Observe and note the color of the glowing filament.
5. Adjust the dimmer switch slowly until the bulb becomes brighter and brighter.
6. Observe and note the color of the glowing filament.
Q1. What is the color of the filament as you dim the bulb?
Q2. What is the color of the filament as you turn the switch at full power?
Q3. What happens to the temperature of the filament as the bulb becomes brighter and
brighter?
Star color ranges from red to blue. The color of the star indicates its surface
temperature. The table below shows the surface temperature and color of
different nearby stars, including the Sun.