Since there is no real surface, this is what is used as the effective radius for such measurements.
I don't know the effective radius of the receiver-I didn't feel like testing it, just yet.
In these calculations, each organ of the body was assumed to be represented as a sphere with an "effective radius".
But she couldn't find any life signs within the device's effective radius.
So she'd expected an opponent to materialize inside the effective radius of her ranged weapons.
The plane is regarded as a very effective in a dogfight because it has a small turning radius.
When they passed the effective radius of the antigrav, they plunged to the ground.
The mine has an effective radius of 20 meters and effective life of 2 years.
This is subtly different to the effective radius of a hydrated molecule in solution.
For example, as one would expect, a galaxy with a higher luminosity has a larger effective radius.