Band gap of bulk(thatis, large size, macroscopic crystal)silicon is 1.14 ev. a quantum dotcan be modelled as an infinite square well in 3 dimensions, and the band gap is differentfor a quantum dot. consider a silicon particlethat is a cubeof size 4nm. calculatethe band gap for this particle, which isthe energy difference between the lowest energy level of the electron in the conduction band and the highest energy level of the hole in the valence band.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

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16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.