Next two highest energy states are (7918 cm-1), and 1©+ g 1¢g (13195 cm-1) where the value in parentheses is the energy of the state relative to the ground state. a. Determine the excitation wavelength required for a transition between the ground state and the first two excited states. b. Are these transitions allowed? Why or why not?

answer: h+ its less than oh

explanation:

he would use the colour black

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.