In a longitudinal wave, the is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. will mark brainliest

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.