2 Sound

What is sound?

• Vibrations that travel through the air

• Sound is a form of energy that does not require a medium.
• Sound is an electrical signal transmitted through wires.
• Sound is a type of light wave.

True or False: Sounds are made when objects vibrate.

• False

• True

What part of your body vibrates to produce sound when you speak?

• Nasal passages
• Eardrums
• Lungs
• Vocal cords

Sound cannot travel in a:

• vacuum
• steel
• air
• water

Name two things that can vibrate to produce sound.

• Piano key
• Drum skin
• Guitar string, tuning fork
• Flute mouthpiece

Through which medium does sound travel fastest?

• Liquids
• Gases
• Vacuum
• Solids

How does sound travel to our ears?

• As vibrations through air

• Sound moves in a straight line without any medium.
• Sound is transmitted through electrical signals directly to the brain.
• Sound travels through light waves to reach our ears.

True or False: Louder sounds have stronger vibrations.

• False

• True

When a drum is hit, what causes sound?

• The vibrations of the drumhead create sound waves.
• The air inside the drum is heated.
• The drum is made of metal.
• The drumstick absorbs sound waves.

Why can’t sound travel in space?

• Sound travels faster in space than in air.
• Sound can travel in space due to electromagnetic waves.
• Sound can travel in space because of solar winds.
• Sound cannot travel in space because there is no medium for it to travel through.