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E5 problems: Light from stars

1. The photo below shows the constellation Orion. Bellatrix is the star on Orion"s left shoulder.The following data is copied from wikipediaDistance from Earth = 77PcRadius = 6RsunLuminosity = 6,400 LsunTemperature = 22,000KApparent magnitude = 1.64a. Show that the absolute magnitude of Bellatrix is -2.73b. Use Stefan Boltzmann Law and the radius to calculate the Luminosity. Compare this with the data.

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