When you have p-type silicon and n-type silicon joined together, ...

[torybrooks]

When you have p-type silicon and n-type silicon joined together, why don't electrons dislodged by light in the n-type cross the junction barrier and enter the p-type?
 
  A) The junction barrier is unidirectional. Electrons can only move from the p-type to the n-type silicon through the junction.
  B) The photoelectric effect causes a charge buildup which prevents the flow of electrons in either direction across the junction barrier.
  C) The boron in p-type silicon's crystal lattice must maintain its electron holes as bonding sites. This prevents the electrons dislodged by light in n-type silicon from crossing the junction barrier.
  D) The arsenic in n-type silicon has an extra valence electron whereas the boron in p-type silicon is missing one. This difference inhibits the electrons dislodged by light in the n-type from crossing the junction barrier.

Question 2

Nucleic acids determine ________.
 
  A) the sequence of amino acids
  B) the pH of the cell nucleus
  C) the number of nucleons in a biomolecule
  D) the rate at which food is metabolized

[Loise Hard]

Answer to Question 1

A

Answer to Question 2

A

[torybrooks]

Thanks for the timely response, appreciate it

[kusterl]

Wow, this really help