Word Count : 231

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इलेक्ट्रॉन का विश्रांति काल (relaxation time) ज्ञात करने के लिए, हम निम्नलिखित सूत्र का उपयोग करेंगे: \[ \sigma = \frac{n e^2 \tau}{m} \] जहाँ: - \( \sigma \) = चालकता (conductivity) - \( n \) = मुक्त इलेक्ट्रॉनों की संख्या घनत्व (number density of free electrons) _______ ______ _________ _____ __________ ____ ________ ____ _______ ____.
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