Blackbody Radiation

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Submitted By ajarvis0413
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Name ______________________ Blackbody Radiation
Go to http://phet.colorado.edu/simulations/sims.php?sim=Blackbody_Spectrum and click on Run Now.

1) In this lab, you will use the Blackbody Spectrum Simulation to investigate how the spectrum of electromagnetic radiation emitted by objects is affected by the object's temperature. In this simulation, you can input the temperature and observe the spectrum of the radiation emitted. a) The temperature of stars in the universe varies with the type of star and the age of the star among other things. By looking at the shape of the spectrum of light emitted by a star, we can tell something about its average surface temperature. i) If we observe a star's spectrum and find that the peak power occurs at the border between red and infrared light, what is the approximate surface temperature of the star? (in degrees C)

Temperature in degrees C = temperature in Kelvin - 273.15 Temperature of the star = 4040 K - 273.15 = 3767 C

ii) If we observe a stars spectrum and find that the peak power occurs at the border between blue and ultraviolet light, what is the surface temperature of the star? (in degrees C)

Temperature in degrees C = temperature in Kelvin - 273.15 Temperature of the star = 7100 K - 273.15 = 6827 C

b) Light bulbs operate at 2500 degrees C. i) What is the wavelength at which the most power is emitted for a light bulb operating at 2500 C? First convert 2500 C into Kelvin. Temperature of bulb in Kelvin = 2500 C + 273.15 = 2773 Kelvin; using the simulation we get 1050 nanometers

ii) Explain why regular incandescent bulbs waste a lot of energy. Be sure to include your reasoning. All of the electricity used to create the light is wasted to heat the filament, and use a lot of…...

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