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एक एकपरमाण्विक आदर्श गैस किसी प्रक्रम में भाग लेती है जिसमे हर क्षण पर P तथा V का अनुपात स्थिर रहता है तथा इसका मान इकाई हो तो गैस की मोलर उष्माधारिता होगी :
A. 2.0 R
B. 1.5 R
C. 2.5 R
D. 0

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Correct Answer - A
माना ताप T पर गैस का दाब P व आयतन V है ।
तब `P_(1)V_(1) = RT`
तथा `P_(2)(V_(1) +dV) = R(T+1)`
अथवा `P_(2)^(2) = RT + R " " (because (P_(2))/(V_(1) + dV)=1)`
अथवा `2((deltaP_(2))/(deltaT))_(V) = R`
अथवा `((deltaP_(2))/(deltaT))_(V) = (R)/(2)`
तथा `C_(P) = C_(v) + (deltaP)/(deltaT) = (3R)/(2) + (R)/(2) = 2R`

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