Question

ELECTROMAGNETISM and LIGHT Develop your hypothesis. Plot the graph using gmphical analysis or excel and answer all questions 1- 16. Plot all 3 data sets (one data set per color) on a single graph. You can use Graphical Analysis or Excel. Do not utilize the best fit line or curve fool Part A Research Question: How does surface color affect absorption of radiation (light energy) and emission of energy? Your Hypothesis (include prediction): the appearance che Surface determine its rates od emission clubb.com of radiator for example shing coloured and metalic surfaces enit of absorb radiation energy slowly Lighton (min.) Light off (min.) 0 White "c25.0 Gray C 250 Black c250 6 9 12 15 18 21 24 27 25 26,5 272 27.9 28.228.7 283 276 26.9 259 27.1 281 29.0 302 293 28.5 27.5 260 272 232 293 312 324 312 300 281 30 33 36 26.3 25.7 25.4 269 262 252 269 259 250 1. Identify the dependent variable from the graph(s) 2. Identify the independent variable (s). 3. Identify the constant(s). 4. Are all three cans made of the same material? (circle origin of following YES or NO. Does this make the type of material used in the experiment a constant? (clicle or highlight one of the following YES or NO 5. What is the benefit of plotting the data for all three cans on one graph? 6. What is the benefit of plotting the data for when the light is shining on the can on the same graph as the data for when the light is not shining on the can? You may find the following helpful when answering the following questions to use terminology that is often used when analyzing a graph. Directly Proportional relationship: Graph is a straight line that passes through the origin. Linear relationship: Graph is a straight line that does not pass through the origin. Non-linear relationship: The graph is not a straight line but curves Increases Decreases, gradual increase or decrease drastic increase or decrease remains constant increases exponentially. Can you think of more? 7. White can: How does the dependent variable change with respect to the independent variable while the light is shining on the can 8. White can: How does the dependent variable change with respect to the independent variable when the light is not shining on the can? 9. White can: Compare and contrast the behavior of the dependent variable with respect to the independent variable when the light is shining on the can, and when it is not shining on the can

Answer 1

Timet (min) 0 3 6 9 12 15 18 21 24 White T (°C) 25 25.8 26.5 27.2 27.9 28.2 28.7 28.3 27.6 26.9 26.3 25.7 25.4 Gray T (°C) 25 25.9 27.1 28.1 29 29.8 30.2 29.3 28.5 27.5 26.9 26.2 25.2 Black T (°C) 25 26 27.2 28.2 29.3 31.2 32.4 31.2 30 28.1 26.9 25.9 25 27 30 33 36

Time t (min) vs Temperature T (°C) White (°C) Gray T (°C) Black T (°C) 40 . . 30 : 00 Time t (min) 20 10 0 0 10 20 30 Tempearture T(°C)

Answer of 1:

The dependent variable is temperature of White, Gray and Black colors.

Answer of 2:

Independent variable is time .

Answer of 4:

All three can are not made of the same material and this does not make the type of material used in the experiment is constant.

Answer of 5:

By plotting the data all together for three cans, we can compare different materials' light radiation emission and absorption.

Answer of 6:

By plotting data when light is shining on the cans and light is not shining on the cans together, we can compare how much absorption of radiation is done by cans when light is shone on the cans and how much emission is done by the cans when light is not shone on the cans.

Answer of 7:

Dependent variable temperature is in nonlinear relationship with the independent variable is time for White light. The temperature is gradually increasing with respect to time once the White light is shone on the cans.

Answer of 8:

Dependent variable temperature is in nonlinear relationship with the independent variable is time for White light. The temperature is gradually decreasing with respect to time once the White light is not shone on the cans.

Answer of 9:

Dependent variable temperature is in nonlinear relationship with the independent variable is time for White light. the nonlinear relationship can be seen as curve in the graph. The temperature is gradually increasing with respect to time once the White light is shone on the cans while the temperature is gradually decreasing with respect to time once the White light is not shone on the cans.

Similar reasoning can be applied for the Gray and Black lights and answered questions 10 to 15. But as we can see that the curve of the Black light is more bend than Gray light and curve of Gray light is more bend than White light which implies that light radiation is sensitive to colors.