1. The Sun as an Energy Source Subtitle Goes Here.

2. Hot Notes Radiation is the direct transfer of energy by electromagnetic waves Solar radiation is energy from the Sun It is a major source of energy on Earth.

3. What is a Radiometer? An indicator of radiant energy.

4. How it works When radiant energy from a light source strikes the white Polished surfaces, most of it is Reflected; but when it strikes the Blackened surfaces most of it Is absorbed. Causing it to spin.

5. How does the distance from the clamp lamp to the radiometer affect the length of time the radiometer vane spins?

6. Constants Amount of light (50 watt) Position of radiometer Position of clamp-lamp Same location (surface) Same amount of time light is on (15 sec)

7. Variable Distance from radiometer 100 cm 50 cm 25 cm

8. Prediction

9. Check in! What causes the radiometer to spin? a.)electromagnetic field b.)love c.)moon d.) none of the above, I will explain

10. Collecting Radiant Energy Data Distance vs. Time Distance From the Lightbulb to radiomet er 100 cm 50 cm 25 cm Time (Number of Seconds Radiometer Continues to Spin after Lights Out) Table 1 15 Table 2 9 11 Table 3 15 37 Table 4 17 12 Table 5 5 21 Table 6 18 25 Ave 12 21 79

11. Conclusion

12. What is a Radiometer? An indicator of radiant energy. Pay attention to the importance of the black and white vanes when you conduct your experiment. Be able to share out their role.

13. Your Turn Refer to student guide page 90 What is the question that you would like to explore? What variable are you changing? Make a table to gather your data Present idea before proceeding.