The document explains the nature of sound, including its production through vibrations and how sound waves travel. It describes key concepts such as pitch, loudness, and the phenomena of reflection and absorption of sound. Additionally, it covers practical applications like soundproofing and the effects of acoustics in various environments.

1. SOUNDS

2. Try to remember the different sounds you
have heard from the time you woke up. Did you
hear the chirping of birds, the oil crackling
while food was cooking, water coming out of a
shower spout, a jeepney passing by, cars
honkinh their horns, cellphones ringing? All
these sound reached your ears and you
recognized them. Some of them are pleasant,
some are not. But do you know how sounds is
produced? This lesson will tell you how sounds
is produced and how it behaves.

3. What is Sound?
Sounds, just like color, adds life to our
world. Each day, we encounter a multitude of
sounds from the time we wake up until we
sleep. Sound can let you communicate with
others or let others communicate with you. It
can be a warning of danger or simply an
enjoyable experience.

4. Sound is very important.Without
sound, we cannot hear our favorite song,
nor the sounds of people, animals, and
objects around us.

5. How is Sound Produced?
Locate your voice box in your neck.
Place two fingers on your voice box and
hum for about three seconds.What do
you feel? Sound is produced when things
vibrate.Vibrating objects sends out
sound waves that travel in all directions.

6. Take a plastic cup and wrap a rubber
band around it so that the band runs over
its opening. Pluck the rubber band like a
guitar string.What do you hear? Pluck
the rubber band again and feel it move
against your fingertips.

7. When you pluck the rubber band,
vibrations are produced.These
vibrations become sounds when they
reach your ears. Particles of air are
pushed together in a particular pattern
called a sound wave.

8. A sound wave causes the surrounding
air to vibrate. Sound waves are received
by the ears and interpreted by the brain.
However, sound waves cannot move
through a vacuum because there is no air
other medium present to vibrate.

9. Pitch and Loudness
Listen to the shrill sound of a
whistle and the beating of a drum. How
are the two sounds are different? The
whistle produces a high sound while the
drum produces a low sound.The degree
of lowness or highness of sound is called
the pitch.

10. When you strum a guitar gently, it
produces a soft sound.When you strum a
guitar harder, it produces strong
vibration, hence, a loud sound. A sound’s
loudness refers to how strong a sound is
when it heard. Loudness diminishes with
distance, so the farther a person is from
the source of sound, the softer the sound
is. Loudness is measured in decibels.

11. Have you tried singing or speaking loudly
in the bathroom? What did you hear? The reason
you can hear your voice back in the bathroom is
because you are in a closed area with walls that
reflect your voice back to your ears.When a
sound wave strikes a smooth, hard surface, it
bounces back.This is called a reflection of
sound or echo.
ECHO

12. During concerts and other programs,
you may hear loud echoes of the music
and other sounds that may be annoying
to you ears.To prevent this, concert halls
and some gymnasiums use acoustic
materials. An example of good acoustic
material is cork because it is soft, rough,
and full of holes that can contain of
muffles sound waves.

13. That is why instead of being
reflected, the sound is
absorbed. Sound absorption is
a process in which sound
energy is reduced when sound
waves pass through a medium
or strike surface.

14. Sometimes, there is a need to
confine sounds in a certain area so the
cannot disturb peple outside.To do this,
places like studious install vinyl board to
trap the sounds within the room and
vlock them from being heard outside.
This is called soundproofing.

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