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)