What is the difference between homogenous mixtures and heterogenous mixtures?
In a homogenous mixture, the different components are not readily discernible. In a heterogeneous mixture, they can be seen and sometime separate of their own accord. For example, oil and water is heterogeneous, while salt and water are homogenous.
In a homogenous mixture the substance are so evenly distributed that it is difficult to distinguish one substance in the mixture from another but it only contains only one substance and it will appear the same. In a heterogenous mixture the parts of the mixture are noticeably different from one another and the mixture is different and kind.
A homogenous beam contains photons of the same energy (monoenergetic)Because the photons all have the same energy, their interactions with materials (such as the absorber) are all the same resulting in uniform attenuation. Heterogenous beams contain photons of different energies. Because the photons have different energies, their interactions with materials (such as the absorber) are different resulting in non-uniform attenuation.