A mono atomic gas at a pressure P, having a volume V, expands isothermally to a volume 2V, and then adiabatically to a volume 16 V. The final pressure of the gas is: δ=53
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a
64 P
b
32 P
c
P64
d
16 P
answer is C.
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Detailed Solution
1st Isothermal processgiven initial pressure P1=P , initial volume V1 =V final pressure be P2 then volume is V2 =2Visothermal process, relation between Pressure P,and volume V is Pα1V⇒P1P2=V2V1---(1)substitute given values in (1)eqn PP2=2VV⇒P2=P/22nd adiabatic process given final volume of the gas is V3=16V In adiabatic process relation between pressure P and volume V is P2V2δ=P3V3δgiven specific heat ratio δ=53 P2P3=V3V25/3substitute the given and obtained values, legiblyP2P3=16V2V5/3P2P3=25 final pressure P3=P64