(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

By comparing with the luminosity of the Sun, calculate the absolute magnitude of a 60W lightbulb. [THe absolute magnitude of the Sun is +4.75; you may ignore colour differences]

2. Relevant equations

m-M=5log(d/10pc)

[tex] f = \frac{L}{4\pi d^{2}}[/tex]

m_{1}- m_{2}= -2.5long(f_{1}/ f_{2})

3. The attempt at a solution

I'm not really sure where to start. I know the luminsoty of the Sun to be 3.8x10^{26}W but I'm not sure how it helps.

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# Homework Help: Absolute Magnitude of Lightbulb

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