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In: Physics

The light at the Earth from a certain star has an intensity of about 71.5×10-8W/m2. If...

The light at the Earth from a certain star has an intensity of about 71.5×10^-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!

Expert Solution

Given data:

Radiation intensity from star to earth =

Radaition intensity from sun to earth =

Let ; x = distance from sun to earth

y = distance from star to earth.

It is given that Radiation power of sun = Radiation power of star

So,

Spherical area for sun at distance x =

Spherical area for star at distance y =

Distance from Sun and earth =

therefore

So distance between, Star and Sun =

genius_generous answered 2 years ago

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