Problem I (30 points):  Consider an n-type semiconductor at temperature T. In thermal equilibrium, the electron and hole concentrations are n₀ and p₀, respectively. Assume the nondegenerate limit so that Boltzmann statistics apply.When the semiconductor is uniformly illuminated, it reaches a steady nonequilibrium state with electron and hole quasi-Fermi levels EFn and EFp, and carrier concentrations n and p. Assume that Eg, Nc, and Nv are known.1. Derive an expression for the product np in terms of the quasi-Fermi levels.2. Draw a schematic band diagram showing the positions of the two quasi-Fermi levels under light illumination. 3, When the light is turned off and the semiconductor returns to equilibrium, derive the product of the electron and hole concentrations in terms of Eg, Nc, and Nv.

Which is the most important immunoglobulin that play a role in immune response to helminths?

How do eosinophils contribute to the destruction of helminths?

Marine mammals occupy most trophic levels in marine ecosystems.

What are the advantages (provide two) and disadvantages of stomach content analysis (provide two)?

Complete the following with can, can’t, could, or couldn’t. 

A: You’ve been running around all day. Aren’t you exhausted? B: Yes, I . I can’t remember the last time I was this tired.

A: Excuse me. Do you know if Flight 534 is on time. B: Yes, it is. It at gate C6 in about five minutes.

Fish talk.

A: The flavor of this soup is interesting, but it’s missing some salt. B: You’re right. I a lot of salt in it.