An acidic medium in my body

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

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

‘which reaction would most likely require the use of an inert electrode?