Mathematics and Society - OS X Lion Server

(COI-l">\\JUE:D)from the strip. You should observe that as the wattage (light energy)increases so does the temperature change. Also the time needed for the strip toreach maximum temperature decreases as the wattage increases.2) Now investigate the relationship betweendistance of ~ light source and temperaturechange. Start by p1acirig a 50-watt bulb5 em from the strip. Take seven morereadings by increasing the distance fromthe bulb to the strip by 5 cm for eachreading. Be sure the strip reaches themaximum temperature and then returns toroom temperature before attempting thenext reading. Graph the results.o__- WATTBULB5 to t5 26 'Z5 so gSDISTANCE. OF LIGHT OOURCE* Use the graph to help you decide at what distance the 50-watt light bulb shouldbe placed so that the temperature change will be the same as the change causedby direct sunlight. See answer from I (e).3) Investigate the relationship between distance and power (wattage) if the sametemperature change is desired. Place a 50-watt bulb 20 cm from the strip andrecord the highest temperature. Double the distance and determine the wattageneeded to produce the same temperature reading. Double the distance again.(80 cm). How many 50-watt bulbs are needed at this distance to produce the samereading as one 50-watt bulb at 20 cm?4) Use the relationship in #3, distance measured in2* and the distance to the Sun (14,960,000,000,000cm) to measure the wattage of the Sun.IDEA FROM: In Orbit, Probing the Natural World, Level Ill, Intermediate Science· Curriculum StudyPermission to use granted by Silver Burdett General Learning Corporation 77