Gas expanded isothermally and then adiabatically (or compressed back): final pressure

1. A.
   $P$
2. B.
   $2P$
3. C.
   $3P$
4. D.
   $4P$

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1. A.
   $P/64$
2. B.
   $P/32$
3. C.
   $16P$
4. D.
   $32P$

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1. A.
   $\dfrac{P}{3}$
2. B.
   $\dfrac{P}{(3)^2}$
3. C.
   $\dfrac{P}{(3)^4}$
4. D.
   $\dfrac{P}{(3)^6}$

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