1:00
en
CR
30
wave
mechanical waves
transverse waves
trough
seismic waves
compression
wavelength
velocity
resonance
sound
ultrasound
echo
reverberations
doppler effect
refraction
pitch
threshold of hearing
threshold of pain
bel
quality
ear
pinna
ear canal
middle ear
ossicles
cochlea
noise
communication
Alexander Graham Bell
electromagnetism
Michael Faraday
Joseph Henry
Thomas Edison
Lee de Forest
telephone
Morse code
electomagnetic waves
interference
human voice
intensity
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