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When a system is taken from state A to s...

When a system is taken from state `A` to state `B` along path `ACB` as shown in figure below, `80 J` of heat flows into the system and the system does `30 J` of work.

If `E_(D)-E_(A)= -40 J`, the heat absorbed in the processes `AD` and `DB` are respectively

A

`q_(AD)=30J` and `q_(DB)= - 90 J`

B

`q_(AD)=-60J` and `q_(DB)= 30 J`

C

`q_(AD)=30J` and `q_(DB)= 90 J`

D

`q_(AD)=-30J` and `q_(DB)= 90 J`

Text Solution

Verified by Experts

The correct Answer is:
D
In `ADB` process, `DB` process is isochoric so `w_(DB)=0`
So, `Delta E_(AD)=q_(AD)+w_(AD)`
`-40=q_(AD)+(-10), q_(AD)= -30 J`
Now, `q_(AB)=q_(AD)+q_(DB), 60 =-30+ q_(DB)`
`q_(DB)=90 J`
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