5th grade chapter 14 section 2 - what is sound energy
TRANSCRIPT
CHAPTER 14 SECTION 2
SOUND–a wave of vibrations that spreads from
its source.
• Vibration is the back-and-forth motion of an object.
Crest - areas where particles are very close together
Frequency - The number of crests that pass by a point each second
The greater the frequency is, the higher the pitch of the sound
Why Are Some Sounds Louder Than Others?
• The source of the louder sounds is vibrating more. • These sound waves have more
energy. • A sound’s loudness can be
measured in units called decibels.
YOUR VOICE
• Your vocal cords vibrate when you talk. • The vibrations are caused by air rushing past
them.• Your vocal cords make the particles in the air
around them vibrate. • These vibrations travel outward through the
air as sound waves.
How Does Sound Behave?• Sound can travel through solids,
liquids, and gases • It cannot travel through a vacuum,
which is empty space that contains no particles• The speed at which sound waves
travel is different in different materials.
Sound Transfers Energy• For a sound to be heard, energy must first cause
anobject to vibrate.
• Vibrating objects give off energy in sound waves in air.
• Some of the energy reaches your ear, and your eardrum absorbs some of the energy.
• In this way, the energy of the original material’s vibrations passes to you.
SOUND–a wave of vibrations that spreads from
its source.
• Vibration is the back-and-forth motion of an object.
Crest - areas where particles are very close together
Frequency - The number of crests that pass by a point each second
The greater the frequency is, the higher the pitch of the sound
Why Are Some Sounds Louder Than Others?
• The source of the louder sounds is vibrating more. • These sound waves have more
energy. • A sound’s loudness can be
measured in units called decibels.
YOUR VOICE
• Your vocal cords vibrate when you talk. • The vibrations are caused by air rushing past
them.• Your vocal cords make the particles in the air
around them vibrate. • These vibrations travel outward through the
air as sound waves.
How Does Sound Behave?• Sound can travel through solids,
liquids, and gases • It cannot travel through a vacuum,
which is empty space that contains no particles• The speed at which sound waves
travel is different in different materials.
Sound Transfers Energy• For a sound to be heard, energy must first cause
anobject to vibrate.
• Vibrating objects give off energy in sound waves in air.
• Some of the energy reaches your ear, and your eardrum absorbs some of the energy.
• In this way, the energy of the original material’s vibrations passes to you.