One mole of an ideal gas is taken from a and b along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work done along the solid line path is w s and that along the dotted line path is w d , then the integer closest to the ratio w d / w s is :
A
Text Solution
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(2)
Process shown by solid line is reversible isothermal
So, work W s = – 4 × 0.5 ln (5.5/0.5) = – 2 ln 11 L atm.
For dotted process (three step irreversible) work done will be
W d = – {4 × 1.5 + 1 × 1 + 
× 2.5} L atm.
= – {6 + 1 + 
} L atm. = – 
L atm.
so, 
2.
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