inverse-square law
phys. Law relating the intensity of an effect to the inverse square of the distance from the cause. Gravity, electric, magnetic, light, sound, and radiation phenomena follow the inverse-square law. […]
inversely proportional
phys. Related so that as one becomes larger the other becomes smaller དངོས་འབོར་ཞིག་ཆེ་རུ་འགྲོ་སྐབས་དངོས་འབོར་གཞན་དེ་ཆུང་དུ་འགྲོ་བའི་འབྲེལ་བ།