Hello every one . We know Radio waves carrying data When a radio device receives radio waves , It render the waves and we hear sound . Now my questions are : 1 - How data on electromagnetic waves are transmitted ? When a electromagnetic wave hit a atom it absorbed by the atom like this http://www.ers-education.org/media/2009/eposters/uploads/Externe/IMAGE_10_1251465376.jpg Then after a short delay another photon is emitted . 2 - What happens to the data at this moment ? 3 - What's the data ? are they atoms ? are they electrons ? are they Community atoms ? or ...... ?