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Grade 8Wave Motion

A metallic block has no potential difference applied across it. The mean velocity of free electrons at absolute temperature T is

Proportional to T
Finite but independent of T
Proportional to √T
Zero

Profile image of mgayathri
9 Years agoGrade 8
Answers icon

1 Answer

Profile image of Satyam Kumar
9 Years ago
Since no potential difference is applied, the formula for drift velocity we usually deal with is invalid. 
However, by dimesional analysis, deducing a relation between energy and Temp. we get
Energy = 0.5mv2= 1.5 k T (where k is Boltzman Constant)
v2 directly proportional to T.
Choice 3 is correct

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