How does the author support this opening statement throughout the text

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

In an oxidation-reduction reaction, oxidation is what happens when a reactant

In a copper wire, a temperature increase is the result of which of the following