Question

In a solar system far, far away the sun's intensity is 500 W/m2 for an inner planet located a distance R away. What is the sun's intensity for an outer planet located at a distance 5 R from the Sun?

Answer 1

`I=20W/m^2`

Step-by-step explanation:

Since intensity is proportional to
`1/r^2`, being at a distance 5 times farther will make the intensity 25 times smaller, which means that the intensity for an outer planet located at a distance 5 R from the Sun is:

`I=(I_0)/(25)=(500W/m^2)/(25)=20W/m^2`