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:<br />$\Phi =\Phi _{0}e^{-\mu x}$<br /><br />Explanation:<br />The formula for the attenuation I of the X-ray flux in a substance is given by the equation $\Phi =\Phi _{0}e^{-\mu x}$, where $\Phi$ is the attenuated X-ray flux, $\Phi_{0}$ is the initial X-ray flux, $\mu$ is the attenuation coefficient of the substance, and $x$ 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.