Understanding Sound

What is a sound wave similar to?

• A ripple in water

• A wave on a slinky spring

• A gust of wind

• A flash of light

What happens when a drum skin is struck?

• It stops vibrating immediately

• It creates a vacuum

• It bends outwards and compresses the air in front of it

• It absorbs the air particles

What is the fleshy part of the ear called?

• Ossicles

• Eardrum

• Pinna

• Cochlea

What do the ossicles do?

• They pass on the wave to a liquid inside the cochlea

• They detect sound waves

• They produce sound waves

• They protect the ear from loud noises

How does the brain recognize different pitches of sound?

• By the speed of the sound wave

• By the size of the eardrum

• By the location in the cochlea where the sound is detected

• By the color of the sound wave

What is the speed of sound in the air?

• 5,000 m/s

• 300 million m/s

• 350 m/s

• 1,000 m/s

What is the speed of sound in the ground?

• 350 m/s

• 1,000 m/s

• 300 million m/s

• 5,000 m/s

What does a microphone do?

• It amplifies sound

• It converts sound waves into electrical signals

• It changes the pitch of sound

• It blocks sound waves

What can the frequency of a sound depend on?

• The temperature of the air

• The size or length of whatever's vibrating

• The shape of the room

• The color of the object

What is the frequency range of human hearing?

• 20 to 16,000 Hz

• 0 to 10,000 Hz

• 100 to 30,000 Hz

• 50 to 20,000 Hz