Wave in which amplitude changes to create sound?

Question

anonymous · Answer

do u hv choices 2 chose from?

anonymous · Answer

A. FM wave 
B. Am wave
C. telecommunication
D. GPS

anonymous · Answer

ok its either going to be A or B I just can't remember which.

anonymous · Answer

maybe AM? do you think?

anonymous · Answer

Can u remind me wat Am and Fm is? If I read it then I'll remember.

anonymous · Answer

AM works by modulating (varying) the amplitude of the signal or carrier transmitted according to the information being sent, while the frequency remains constant. This differs from FM technology in which information (sound) is encoded by varying the frequency of the wave and the amplitude is kept constant.

anonymous · Answer

u just answered ur own question. " This differs from FM technology in which information (sound) is encoded by varying the frequency of the wave and the amplitude is kept constant." lol it's going 2 b A

anonymous · Answer

oh wow haha im too lazy to read any of it lol anyways huge thanks i apppreciate it :)

anonymous · Answer

no prob anytime