Figure shows the band structure of a PN abrupt junction under a bias voltage: 1)Is the bias positive or negative? Calculate the value.
2)Calculate the built-in voltage of the PN junction.

A)-in the process of engineering design, explain the contribution of material selection. b)- explain the procedure of synthesis as is employed in engineering design. c)- is there any relationship between ergonomics and engineering design? explain. d)- safety consideration in engineering design includes human, product and the enviroment . explain how safety will be incorporated into the design?