Cambridge Checkpoint Science 8: Sound

Sound travels as

• transverse waves
• longitudinal waves
• seismic waves
• air waves

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Sound vibrations travel down the ear canal to the

• hammer

• anvil

• cochlea

• eardrum

• stirrup

Sound waves are collected by the outer ear (pinna) , then travel down the ear canal. The sound wave in the ear canal is caused by

• air particles travelling all the way from the outer ear, then through the ear canal

• air particles in the ear canal vibrating up and down

• air particles in the ear canal vibrating backwards and forwards, but not really changing where they are

• nerve cells vibrating in the liquid found in the ear canal

As air particles are pushed together, they create a region of higher density and pressure in a longitudinal wave.  These areas are called:

• sound waves
• rarefactions
• compressions
• transverse wave

As air particles become less crowded a region of lower density and pressure is created. This part of a longitudinal wave is called a: 

• compression
• sound wave
• rarefaction
• transverse wave

Sound travels at different speeds through different mediums.  Through which medium would your voice travel the fastest?

• Air on a cold winter morning
• Air on a hot summer afternoon
• A metal wall
• A pool

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

This part of the ear is vibrated by sound waves.  It is a lightly stretched membrane that is the entrance to the middle ear.

• Pinna
• Ear Drum
• Hammer
• Cochlea

This fluid-filled snail-shaped sack in the inner ear contains hair cells attached to nerves which transmit sound information to the brain. 

• Cochlea
• Hammer
• Anvil
• Stirrup

Your __________ vibrate when you talk

• stomach
• lips
• ears
• vocal cords

An oscilloscope (with a microphone) can show an electrical representation of sound ________

• vibrations

• patterns

• imitations

• waves