Chapter 10
Sound Waves
Group 1
Teacher Group Members
Pn Nor Hayati • Foo Shibin
• Goh Ji Young
• Lee Chen Xin
10.1 Characteristics of Sound Waves
• Surrounding are filled with a variety of sounds.
• Sound is a form of energy caused by vibration.
• Example : Guitar will produce sound through vibration.
Transfer of Sound
• Requires a medium to propagate.
• Sound will propagate through a liquid , solid and gas but
not through vacuum.
• When a bell is rung , the metal surface of the bell will
vibrate.
• This vibration is transferred from one molecule to another
molecule which it produces sound.
Speed of transfer of sound in solids
Sound is transferred Particles at one end
very rapidly in solids of the solid start to
vibrate
Reason: VIBRATION
Nearby particles will
vibrate as the
particles of solids
are arranged very
closely together
Speed of transfer of sound in liquids
• The loose arrangement of particles in liquid causes sound
vibrations to be transferred less rapidly compared to solids.
Speed of transfer of sound in gases
• Sound waves propagate very slowly in gases.
• The arrangement of gas particles which are far apart
from each other causes a delay in transfer of vibration.
Reflection and Absorption of Sound
• Sound can be reflected and absorbed when it hits the
surface of an object.
• These characteristics are same as the characteristics of
light.
• The amount of sound reflected or absorbed depends on
the surface of the object.
Sound reflectors and Sound Absorbers
Good Sound Reflectors Good Sound Absorbers
• Hard and smooth • Soft and rough surfaces.
surfaces.
• Examples: carpet,
• Examples: marbles tiles, softboard.
wall.
The End
Thank You!