Which of these conditions most likely produces an unstable isotope?

equal numbers of protons and neutrons in a small nucleus

equal numbers of protons and neutrons in a large nucleus

more neutrons than protons in a nucleus

more electrons than protons in an atom

the answer is 0.8m.

by: nicholas

the answer is d.) potassium

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.