Which has a greater mass, 1 mole of hydrogen (H) atoms or 1 mole of sodium (Na) atoms?

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.

Stage in which a star’s outer layers have started to cool and grow outward?

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.