Kat M.

asked • 03/10/20# What is the luminosity of this star?

A star observed has a brightness of 0 W·m^{-2} and has a distance determined to be 6.41×10^{17} m (16.60 parsecs). Use the equation: B=L/4(pi)d^{2} to solve this problem.

Thank you!!

## 1 Expert Answer

Ariel G. answered • 03/18/20

Former Middle/High School science teacher with tutoring experience

In order to solve for Luminosity (L), we must figure out what we know from our equation first:

Brightness (B) = 0 Wm^{2}

Distance (d) = 6.41 x 10^{17} m

Pi = 3.14

1) Solve for L

B=L/4(pi)d^{2}

B*4(pi)(d^{2})=L

2) Plug in what we know into the equation given

0*4(3.14)(6.41x10^{17})^{2}=L

L=0

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