Black Body radiation
Name __________________ Blackbody Radiation Lab 11
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) 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) 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? 1050 nm
ii) Explain why regular incandescent bulbs waste a lot of energy. Be sure to include your reasoning.
The majority of light that comes from one is majorly is wavelengths longer than the visible, which makes for wasted power.
2) In this problem we will explore the greenhouse effect by using the Greenhouse Effect Simulation available from http://phet.colorado.edu/simulations/sims.php?sim=The_Greenhouse_Effect a) Explore the simulation.
True or False
The only effect of increasing the number of clouds is to reduce the amount of sunlight absorbed by the surface of the earth. False
True or False Increasing the concentration of greenhouse gases, increases the amount of radiation that Earth emits to space. False
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) 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) 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? 1050 nm
ii) Explain why regular incandescent bulbs waste a lot of energy. Be sure to include your reasoning.
The majority of light that comes from one is majorly is wavelengths longer than the visible, which makes for wasted power.
2) In this problem we will explore the greenhouse effect by using the Greenhouse Effect Simulation available from http://phet.colorado.edu/simulations/sims.php?sim=The_Greenhouse_Effect a) Explore the simulation.
True or False
The only effect of increasing the number of clouds is to reduce the amount of sunlight absorbed by the surface of the earth. False
True or False Increasing the concentration of greenhouse gases, increases the amount of radiation that Earth emits to space. False