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48. A gas ( γ=1.3) is enclosed in an insulated vessel fitted with insulating piston at a pressure of

105 N/m2 . On suddenly pressing the piston the volume is reduced to half the initial volume. The final pressure of the gas is

(a)  20.7 ×105                         (b) 21.3 ×105

(c)  21.4 ×105                          (d)  None of these

Answer-b

(3)

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