Question

(a) How does the resistance of a pure metal change if its temperature decreases?
(b) How does the presence of impurities in a metal affect its resistance?

Answer 1

Explanation:

A) as temperature decreases, resistance in a pure metal also decreases.

B) with the presence of impurities the resistance increases and vice versa.

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Answer 2

Explanation:

• (a) When the temperature of the pure metal is raised then the resistance increases and when the temperature is lowered then the resistance decreases.
• Therefore, the resistance decreases when the temperature of the pure metal decreases.  
• (b) Metal does not undergo oxidation when the temperature is high.
• As a result, the impurities present in the metal increases the resistance or its resistivity.
• Therefore, the presence of impurities in a metal increases its resistance. So, the higher is the impurities higher the resistance and vice versa.