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Observation Record Form for Activity 2 – Unit B Part I Blackbody lab (Mandatory) Directions : Go to the University of Colorado Boulder PhET interactive simulations website at https://phet.colorado.edu/en/simulations/browse . Open the Blackbody Spectrum simulation. Make sure to check the “Graph Values” and “Labels” check boxes. See Figure 1. Set the simulation to a temperature of 4500 K. What is the most intense wavelength at 4500 K (in units of μm)? Answer: 0.644μm What is the Spectral Power Density at the most intense wavelength at 4500 K (in units of MW/m 2 /μm)? Answer: 23.74MW/m 2 /μm Now move the white dot to 0.777 μm but keep the temperature at 4500 K. At 4500 K what is the Spectral Power Density at 0.777 μm Answer: 21.93 MW/m 2 /μm Set the simulation to a temperature of 6500 K. What is the most intense wavelength at 6500 K (in units of μm)? Answer:0.446 μm What is the Spectral Power Density at the most intense wavelength at 6500 K (in units of MW/m 2 /μm)? Answer: 149.30 MW/m 2 /μm

Now move the white dot to 0.777 μm but keep the temperature at 6500 K. At 6500 K what is the Spectral Power Density at 0.777 μm Answer:81.29 MW/m 2 /μm At what temperature is the peak intensity at 0.580 μm? Answer:5000 K Part IIb Spectroscopic Data Analysis (Option 2) If you choose to do Part Iib instead of Part Iia answer the the following 10 questions. These questions are refer to the plots of the spectra for the following seven objects: Deneb, Vega, Nova Oph 2015, Menkalinan, bet LYR, Regulus, Mirach For this assignment the significance of emission and absorption features is relative to the spectrum around the feature. Which spectrum has the most prominent emission feature? Answer: Figure 10: Bet LYR Give at least two wavelengths at which at least one spectrum has emission and another has an absorption? The two wavelengths don’t have to be on the same two spectra. For example the first wavelength can be on spectra A and B while the second wavelength could be on spectra C and D. Answer: emission wavelength: 6600 Å Nova oph 2015

Absorption wavelength: 4800 Å on the Menkalinan graph Which spectra appear to not have significant emission features? Answer: Regulus, Menkalinan, Vega Which spectrum has the most prominent emission feature at 5872 Å? Answer: Bet LYR Are there spectra that do not have emission features? If so which ones? Explain your answer. You may wish to draw on the spectrum to illustrate your explanation and included on this page. Answer: Regulus Menkalinan Vega all of these spectra have more diffs that are showing absorption in comparison to emission features of the spectra. This shows that light is being absorbed more than emmited Ignoring the emission and absorption features which spectrum is more intense in red than blue wavelengths? Answer: Mirach Between Bet LYR and Menkalinan which spectrum has more significant absorption or emission features in the wavelengths from 4000-4500 Å? Answer:Menkalinan Between Vega and Deneb which spectrum has its most intense wavelength closer to

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red? Answer: Vega

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