6. Choose the correct : answer Idicate the formula for the attenuation I of the X-ray flux in a substance: Phi =Phi _(0)e^-mu x Phi =Phi _(0)/mu x Phi =Phi _(0)mu x^-2 Phi =Phi _(0)(-ln(mu x))

The correct answer is: Explanation:The formula for the attenuation I of the X-ray flux in a substance is given by the equation , where is the attenuated X-ray flux, is the initial X-ray flux, is the attenuation coefficient of the substance, and is the thickness of the substance. This formula is derived from the exponential attenuation law, which describes how the intensity of an X-ray beam decreases as it passes through a material.