C. A - ion (negative ion, one with extra negative charge)?

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

During which movies do spring tides new moon first quarter waxing gibbous waxing

Acontrol during an experiment. might change remains constant does not exist does change