- #1
Phys12
- 351
- 42
Can you use the flux-luminosity relation, f=L/4*pi*d^2 to calculate the flux of a flashlight at a distance d? As I understand, we can use the relationship given above for a star since we assume that it emits radiation uniformly in all directions, we take the total energy emitted and then divide it by the area in which we receive that energy. But for something that's not spherical, can we still use this relationship? My guess is no. And if no, how do you measure the flux from a flashlight at a distance?