Answer to Question #275578 in Atomic and Nuclear Physics for Longman

Question

(A) Explain how pure metal and a semi conductor can be distinguished through the effect of temperature on their electrical resistance

(B) explain what is meant by (I) an n-semi conductor (ii) a p-semiconductor

(C) state two advantages and one disadvantage of a junction diode over a thermionic valve

Answer 1

(A) Pure metals increase resistance while heating, semiconductors have their own unique resistance change patterns depending on temperature.

(B) An n-semi conductor has electrons as major charge carriers, a p-type semiconductor has holes as a main charge carrier.

(C) Advantages: smaller size, higher reliability. Disadvantage: dependence on temperature.