which of the following is true regarding activation energy?
a. lt does not hold up a reaction from starting
b. it is required only in endothermic reactions
c. this energy usually comes in the form of light or heat
d. it is required only in exothermic reactions

Option (C) is the correct answer.

Explanation:

Activation energy is defined as the minimum amount of energy required by the molecules of a reactant to undergo a certain reaction.

Therefore, when energy in the form of heat or light is provided to a substance then its molecules gain kinetic energy. As a result, molecules have gained activation energy to carry out a reaction.

Thus, we can conclude that statement true regarding activation energy is that this energy usually comes in the form of light or heat.

a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."