what is solid angle subtended by moon at any point of earth The diameter of moon is3474km and it's distance from earth is3. 84*10^-8
Hello there,
Based on your query this is how you have to find the solid angle,
The given diameter is d = 3474km
therefore the radius r = d/2 = 3474/2 = 1737km
Area of moon's projection = pi*r^2 (pi r sqaure) = pi*1737*1737 km*2
Now, Solid angle = area/ (distance)*2
= (pi* 1737* 1737)/(3.84*10^-5)*2 given distance is 3.84*10^-8 but converting it into km you get 3.84*10^-5
you get 6.438*10^-9 steradians.
The SI unit of solid angle is seradians
Hope this answer helps.
Thank You!