An element with an atomic number of 12

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

How much energy is made when a pice of wood burns. how do you know

In 2002, the rare earth elements mine in mountain pass, california was closed because