A new band sensation is playing a concert and recording it for a live album to be released this summer. select all the statements that are true for band producing sound.

a) the frequency or amplitude of the sound waves will not change
b) the frequency or amplitude of the sound waves will change if the singer varies their voice
c)producing sound changes the wane from an electromagnetic wave to a mechanical wave
d)the produced sound waves are mechanical waves
e)the produced sound waves are electromagnetic waves
f) producing the sound does not change the wave type
g) producing sound changes the wave from mechanical wave to an electromagnetic wave