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Tips to solve Heat and Thermodynamics IITJEE questions
- Net Heat flow at a junction is Zero
- Internal Energy does not depend on the path
- Internal Energy in a cyclic Process is zero
- Workdone is given by the area enclosed by the process on the PV diagram
- Always make sure you Heat(Q) ,Internal Energy(U) & Work(W) with correct sign in equation
U=Q-W
W is positive when work done by the system(Increase in Volume)
W is negative when work done on the system(Decrease in Volume)
Q is positive when heat is given to the system
Q is negative when heat is taken from the system
- Change in Internal energy is zero for a cycle
So Net Heat=Net Work done
- All Bodies emit radiation at all temperature.Radiation emmited are of diffrent frequencies.Frequency at which most radiation are emmitted are directly proportional to Temperature of the body.
- Isothermal Process
Pv=constant
VdP+PdV=0
-VdP/dV=P
Now Bulk Modulus= -VdP/dV
So Bi=P
Adiabatic Process
PVy=constant
VydP+PyVy-1dV=0
So Ba=yP
- if A sold sphere and a hollow sphere having same material and size are heated to same temperature and allowed to cool in the same surrounding ,it has been found that hollow sphere cools faster than solid sphere
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