1. Always make sure you Heat(Q) ,Internal Energy(U) & Work(W) with correct sign in equation
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
2. workdone in a cycle is equal to the area enclosed on the PV diagram
3. Change in Internal energy is zero for a cycle
So Net Heat=Net Work done
4.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.
Class 9 physics notes on chapter motion is now available at the following link CLASS 9 MOTION NOTES (FULL LENGTH)
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