12. Just like all longitudinal
(com
pression)waves, sound
Waves possess a velocity,
frequency, wavelength,
phase, period, and am
plitude
Sound waves also reflect,
refract, diffract, and interfere.
15. 1
. PITCH
-highness or lowness of a
sound.
a. FREQUENCY
-number of sound waves
that passes through a point
in a certain amount of time,
such as one second.
-the greater the frequency,
the higher the pitch.
Hertz (Hz)- unit to measure
frequency and pitch
16. Audio frequency range
-Frequency ranging 20 Hz to 20 000 Hz
-Soundsthat human ear can hear isan
example.
INFRASONICS
-Frequency below 20 Hz.
17. 2. LOUDNESSor intensity
-description of how high or
low the sound seems to a
person
-determined mainly by the
amplitude of the sound
wave
a. Decibel (dB)- unit used to
measure sound intensity or
loudness.
18. LOUDNESS OF SOUND IN DECIBELS
Sound Loudness (dbs) Hearing
Damage
Average Home 40-50
Loud Music 90-100 After long
exposure
Rock Concert 115-120 Progressive
Jet Engine 120-170 Pain
19. THRESHOLD OF
HEARING
-SOUND OF THE
QUIETEST SOUND
THAT CAN BE
HEARD UNDER
IDEAL CONDITIONS
IS 0 DB.
THRESHOLD OF
PAIN
- SOUND LEVEL OF
120 DB WHICH
CAN PAIN AND
DAMAGE TO THE
EARS.
20. The human ear relates
amplitude to
loudness
and
frequency to
pitch.
21. 3. TIMBRE
-tone color or tone quality
-used to distinguished
between two different
soundsthat have the
same pitch and loudness
- It helps to identify what
produced the sound
2 Different waveforms
1. Pure tone- simplest wave
form, it has a soft,
pleasant tone quality
and sinusoidal
2. Complex tone- nearly
sinusoidal
22. A. SpEED Of SOUND
Dependson:
1.Type of medium
-travels better through liquids and
solids and gas
can’t travel through a vacuum.
2. Temperature of medium
-travels faster at higher
temperature.
3. Density
-sound moves well through dense
materials.
4. Elasticity
-sound waves move fast through
elastic materials
23. B. DOPPLER EFFECT
🞭 Doppler Effect
🞭 change in wave frequency
caused by a moving wave
source
moving toward you -
pitch sounds higher
moving away from you -
pitch sounds lower
24. A. Refraction of sound
-change in direction,
as the wave moves
from one medium to
another
- It bends or refracts
as they move
through air.
29. 2 types
Constructive interference
-the sound waves arrive at
the same time and phase
Destructive interference
-waves arrive at interval
and are out of phase
30. * Fac t *
D. Resonance
- the inducing
of vibrations of a natural
rate by a vibrating source
having the same frequency
31. A. CHARACTERISTICS Of mUSICAL SOUNDS
Note- basic element of music
1.Pitch- highness or lownessof
the note
2. Intensity- loudness of the note
3.Rhythm- repeating pattern of
beatsand it keeps the time to
the music
4. Melody- series of pitches
5.Harmony- three or more notes
played together.
32. * Fac t *
Noise- unwanted sound
and a subtle pollutant
which can threaten the
Health or well being of
an individual.
33. CLASSIFICATION OF INSTRUMENTS
A. Stringed instruments
- Produce a tone when their strings
vibrated.
B. Wind instruments
-contain a column of air that vibrates when
air is blown to the instrument
C. Percussion instruments
-produce sound when they are struck