The following (Attached image) is an external quantum efficiency of a CZTS solar cell with structure Glass/Mo/CZTS/CdS/AZO/Ag. The ideal QE curve would be a rectangle (red curve). The experimental QE is much less than the ideal one because of losses at different regions outlined 1, 2, 3 and 4. Please explain what are those losses.

For the circuit shown a) Determine the mode of operation that the transistor is in. Assume that V1>0. Show work to justify your reasoning. b) Sketch la vs V1 (this plot may be qualitative) la

Two objects collide head-on (see figure below). The first object is moving with an initial speed of  v1i = 8.09 m/s  and the second object is moving with an initial speed of  v2i = 10.00 m/s.  Assuming the collision is elastic,  m1 = 5.06 kg,  and  m2 = 6.18 kg,  determine the final velocity of each object. (Indicate the direction with the sign of your answer. Positive is to the right, and negative is to the left. Due to the nature of this problem, do not use rounded intermediate values in your calculations) v1f  =   m/s v2f  =   m/s

A dart hits the small square target shown below at a random point. Find the probability that the dart lands in the shaded circular region. Each side of the target is 15cm, and the radius of the shaded region is 5cm?