1. which is not a characteristic of background radiation?

C.) It burns and causes lung cancer

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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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.