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Heat and Thermodynamics question

2006 · Q166
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Heat and Thermodynamics question

2006 · Q166

NEETPhysicsHeat and ThermodynamicsMCQ+4 / −1
The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is
  1. A
    9/7
  2. B
    7/5
  3. C
    8/7
  4. D
    5/7
View written solutionFree

Correct answer: B

CP=72R;CV=CP−R{C_P} = {7 \over 2}R;{C_V} = {C_P} - RCP​=27​R;CV​=CP​−R

=72R−R=52R = {7 \over 2}R - R = {5 \over 2}R=27​R−R=25​R

CPCV=7/2R5/2R=75{{{C_P}} \over {{C_V}}} = {{7/2R} \over {5/2R}} = {7 \over 5}CV​CP​​=5/2R7/2R​=57​

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