Change in internal energy is independent of path followed. Is it true? Why?

The change in internaL energy of a system depends on

Define internal energy of a system .

What will be the change in internal energy of a system if no work is done on the system but q amount of heat is taken out from the system and given to the surroundings.

The ratio of specific heat of a agas at constatnt pressure to that constatnt volume is gamma . The change in internal energy of one mole of a gas when volume changes from V to 2V at constant pressure P is

The internal energy of a perfect gas does not change during

Why can't we obtain interference using two independent source of light?

What do you mean by internal energy and enthalpy?What is the relationship between them?

What is meant by internal energy of a thermodynamical system ?

A piece of lead is hammered. Does its internal energy increase? Does the heat enter the lead from outside?