Astro. question: How to use the inverse square law of radiation to determine distance of star?
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I'm having a problem with an astronomy question. Using the inverse square law of radiation you can determine the intensity of a star at a given distance. I understand that, but my problem is if you can use only the intensity to determine distance. I don't see how you can because when you determine intensity you're only finding a relative intensity (that it is 1/4, or 1/9 as intense as the star actually is). Don't you also need the star' brightness to determine distance?
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Answer:
Absolutely, You do need the initial intensity. But that can be found from other factors, including the spectrum emmitied, mass, composition etc.
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