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Q.

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
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