inner
Sound waves are not part of the electromagnetic spectrum. Sound waves are mechanical waves that require a medium, such as air or water, to propagate, unlike electromagnetic waves which can travel through a vacuum.
Sound and light waves are an example of channel.
Electromagnetic waves, of which group light is a part, travel through space and do not require a medium for their propagation. As do mechanical waves such as sound and vibration. The E-M waves of course, diminish in strength by the usual inverse r-squared process.
gathers sound waves.
Collecting sound involves gathering audio signals using a microphone or other recording device. Capturing sound waves refers to the process of converting these sound waves into electrical signals that can be stored or processed digitally. In essence, collecting sound involves capturing sound waves as part of the overall process.
The eardrum
resonator
ear drum
Sound.
Ear canal
External (outer) ear.
pinna