Which of the three substances has the greatest porosity?
a. gravel
b. sand
c. silt
d. all are equal

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Amixture with the same composition throughout is!