In photosynthesis what form of energy is sunlight converted to

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?