Which energy transition may take place in the atom if its electron has absorbed a photon?

If a 12-v battery is connected to a circuit that has a current of 3.0 a, what is the total resistance in the circuit? 36 ohms 4 ohms 0.25 ohms

Modern weaponry has increased the number of deaths in wars and violent conflicts.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?