A bright flash of light has a measured intensity of 800 W/m² at a distance of 1 m from the source. What will be the measured intensity 10 m away from the source, treating the source as point-like?
a) 80 W/m²
b) 8 W/m²
c) 800 W/m²
d) 0.8 W/m²
e) 8000 W/m²