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# CBSE Class 11-science Answered

pls help me to solve the 59th question
Asked by thejasvi001 | 02 Jan, 2021, 07:49: PM
Fast and sudden expansion of gas is adiabatic process.

For adiabatic expansion of gas, we have,

......................(1)
where p is pressure and v is volume . subscript i stands for initial state and subscript f stands for final state.
γ is ratio of specific heat .

we are given that , specific heat at constant volume , Cv = 2R

we have , Cp - Cv = R  , where Cp is specific heat at constant pressure.

Hence Cp = 2R+R = 3R  and γ = ( Cp / Cv ) = (3R / 2R ) = 1.5

Hence ratio of initial pressure to final pressure is determined from eqn.(1) as

-------------------------
Answer :- Ratio of initial to final pressure is nearly equal to 5
Answered by Thiyagarajan K | 02 Jan, 2021, 09:25: PM
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