A monoatomic gas at pressure P1 and volume V1 is compressed adiabatically to 18th of its original volume. What is the final pressure of the gas
P1
64P1
16P1
32P1
A
64P1
B
32P1
C
16P1
D
P1
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Solution
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Ideal gas equation, for an adiabatic process is PVγ= constant or P1Vγ1=P2Vγ2 For monoatomic gas γ=53 P1V5/31=P2(V18)5/3 ⇒P2=P1×(2)5=32P1
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An ideal gas expands isothermally from a volume V1 to V2 to and then compressed to original volume V1 adiabatically. Initial pressure is P1 and final pressure is P3. The total work done is W. Then