Cell phones contain rechargeable batteries that transform chemical energy into electrical energy. when using your cell phone, electrical energy is first transformed into that are transmitted through the air. a) sound waves. b) sound energy. c) mechanical energy. eliminate d) electromagnetic waves

the answer is d

Option (D) is the correct answer.

Explanation:

Electric field and magnetic field result in the formation of waves known as electromagnetic waves.

In cell phones, when chemical energy is converted into electrical energy then electrical energy first transforms into electromagnetic waves which travel through air.

After that this electromagnetic wave is transformed into sound energy due to which we are able to listen music, movies etc on our cell phones.

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.