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haridas_mandal
An ideal gas is subjected to a cyclic process ABCD as depicted in the P-V diagram given. Which of the following curves represents the equivalent cyclic process?
Where is the 'given' P-V diagram?
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What's the question? cyclic process equivalent to? any equation given?
The diagram is on the extreme left is the PV Diagram and the all the 4 options given on P-T diagram. My fault , I do not know how to amend the sketch as there is no eraser facility..One of the 4 options is right.
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ok lets do this section by section.. in your original graph.. section A to B.. what kind of process is it??
It is const pr i.e isobaric one.
ok.. so you see that volume is expanding keeping pressure constant... now tell me during this process what happens to temperature?
PV=nRT v is directly proportional to T hence it creases.
correct.. so now.. match the options.. for AB section!!
which options can you eliminate ??
right extreme which is no 2 in this question.
|dw:1359878043806:dw| NOW TELL WHICH OPTION can you eliminate?
first column second row as it shows pr not constant. and as i have said right top most as the arrow is shown from B to A.( though I am not sure of that)
the arrow has to be opposite.. now i have marked 4 options dude.. i have called it A B C D.. :P.. so you are saying you can eliminate option C right??.. you are correct .. cause pressure is increasing in that you can also eliminate option A.. so its between option B and D..
why A? Pr as shown is constant here.
It was my fault not to show it correctly. Line a-b at A is parallel.
ohhww.. ok ok :).. fine.. so then lets continue with section BC.. what do you think happens?
It is either isothermal or adiabatic
yea well.. its very difficult to make out if its an isothermal or adiabatic!! :-/.. lets skip that.. and go to C-D process!!
It is ischoric , volume is const.
correct.. and pressure is decreasing.. so temperature should be decreasing.. time to eliminate one more option.. which one?
correct.. so now it boils down to whether the BC and DA processes are adiabatic or isothermal.. thats where i really dunno how to find out.. :-/.. but in your option B.. the order is opposite.. so if the directions are like that.. then option B can be eliminated right?
Problem is the correct option given is as B that is the right upper most. and not been explained. Pl help.
since its reversible maybe .. the direction doesn't matter.. !!!
you have to look at the curve in AB section.. if the curve is STEEEP .. its an adiabatic.. if the curve is not all that steep.. then its isothermal
can't draw :P.. http://physics.info/pressure-volume/ check this.. !!
Ok thanks I shall come back.
i need to go now.. sorry :(... but ll reply once i am back.. if no one else clears your doubt that is!!