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The modern-day quantum model of the atom is better than John Dalton's model because it

is easier to understand.
O is a more recent theory.
can be represented in two dimensions.
answers many questions about atoms.

u i forgot the answer?

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d

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.