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SOUND WAVES (Sound can propagate through (liquids (travels less rapidly…
SOUND WAVES
Sound - form of energy caused by
vibration
Sound
needs a medium
to
propagate (generate)
Sound
can propagate through
liquids
travels
less rapidly
(particles are
loose
)
solids
travels
very rapidly
(particles are
close together
)
gases
travels
very slowly
(particles are
far apart
)
Reflection & Absorption
Sound can be
reflected
and
absorbed
when it hits the
surface of an object
Hard
and
Smooth
surfaces - good sound
reflectors
marble tiles
wall
Soft
and
Rough
- good sound
absorbers
carpet
softboard
Loudness and Pitch of Sound
strength and loudness of a sound = the
amplitude
(maximum extent of vibration) of sound wave
pitch of sound depends on
frequency (Hertz : Hz)
of sound produces
Doppler effect is
apparent change in frequency
by movement of sound source
two types of sound waves
longitudinal waves
transverse waves
Phenomenon and Application of sound waves
Echo - when sound waves are reflected
Limitation of Hearing
humans can only reach a frquency of 20Hz to 20000 Hz
it becomes
narrower as we age
as we
lose sensitivity to sound frequencies
animals have better hearing ranges
Special devices to help with the limitations includes
stethoscope - hear a patients heartbeat
megaphone - amplifies voice
hearing aids - sound entering the ear
