A metallic block as no potential difference applied across it, then the root mean velocity of fr...

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A metallic block as no potential difference applied across it, then the root mean velocity of free electrons is \( T= \) absolute temperature of the block)
(a) Proportional to \( T \)
(b) Proportional to \( \sqrt{T} \)
(c) Zero
(d) Finite but independent of temperature
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