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The light at the Earth from a certain star has an intensity of about 80.5×10-8W/m2. If...

The light at the Earth from a certain star has an intensity of about 80.5×10-8W/m2. If the star emits radiation with the same power as our Sun, how far away is it from Earth? NOTE: Use 1000 W/m^2 as the intensity of the Sun at the Earth!

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Answer #1

Let I, I I2 -7 intensity room star intensity from sun 8 distance of star distance of sun - a 8 = 1.4964 lolm I = 80.5 x 10-8

By Inverse square Jaws, loco X(1.496X10) 80,5X.105 Ya = 27.8 x 1030 x = 5.27x105m

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