alleryResistivity of a metal as temperature increases:
ADecreases
BStays constant
CIncreases
DBecomes negative
Answer & Solution
Correct answer: C. Increases
1. In a metal, free electrons scatter more with lattice vibrations (phonons) at higher T.
2. So ρ INCREASES with temperature for metals.
3. Opposite for semiconductors (ρ decreases as more carriers are thermally excited).
_Source: syllabus Science Ch 11 §11.4.1 Factors Affecting Resistance_
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