If the density of osmium is 22.6 g/cm3 then how much space would be occupied by 4.0 kg of osmium?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward

What are similarities and differences between refraction, reflection, diffraction and absorption?