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Flashcards in Sound Deck (27):

What causes sound?

Sounds are made when an object vibrates.


How many different types of vibrations are there and what are they called?

There are 2 types of vibration.
Compression & rarefaction


When do compressions occur?

When particles are closest together


When do rarefaction occur?

When particles are furthest apart


What kind of wave is sound?

Sound is a longitudinal & mechanical wave.


Can you hear sound in a vacuum. Eg Space

No. In a vacuum there is no air particles to vibrate, therefore, no sound


What state of matter does sound travel fastest in?

Solids. It is the most dense state of matter


How do you calculate speed, distance and time?

Speed = distance/time
Time = distance/speed
Distance = Speed x Time


What is the speed of sound in air, liquid and solid?

Air = 350 m/s
Liquid = 1500 m/s
Solid = 4000 m/s


What happens when we hear sound?

Sounds are collected by the ear lobe
The waves travel along the ear canal
The waves make the ear drum vibrate
The small bones (ossicles) amplify the vibrations
The cochlea turns these into electrical signals
The auditory nerve takes these signals to the brain


What is the human hearing range

20 - 20,000 Hz


How does wax in the ear occur and how to we fix it?

Wax in the ear is caused by an over reactive gland. You would fix this with a syringe in the ear


How is a perforated eardrum caused and how do we fix it?

A very loud noise Eg Explosion
Small holes will heal over time while larger holes may need a skin graft.


How is an earache caused and how do we fix it?

Cussed by infection. You would need antibiotics to fight the infection.


How is tinnitus caused and how do we avoid it?

Tinnitus is caused by regular loud noise, all you need to do to get rid of it is to avoid loud noises.


How is limited movement of the ossicles caused and how do we fix it?

Limited movement of the ossicles is caused by old age, this is cured with hearing aids to amplify the vibrations.


What is noise

An unwanted sound.
A form of pollution.
A nuisance.


What can nosies do?

They can make you feel ill
Make you temporarily blind
Make you tired and short tempered
Damage your hearing


How can you reduce noise?

Wear ear protectors.
Don’t make the noise if possible
Sound dampening (eg acoustic foam, ear protectors etc.)
Distance yourself from the source


What can sound waves be studied with?

An oscilloscope, signal generator and loudspeaker


How can we tell the volume of the sound wave?

The height of the wave


How can we tell the pitch of a sound wave?

The frequency of waves, how many there are.


Look at your ear diagram in your book, label it.

How did you do?


What is the function of the ear drum?

When sound waves reach the ear drum, it vibrates.


What are the ossicles?

Small bones called the hammer, anvil and stirrup. These bones help make vibrations louder.


What is the oval window?

The oval window has a smaller area than the ear drum and passes bigger vibrations to the cochlea


What is the cochlea?

The cochlea is shaped like a snail shell. It is filled with a liquid. The vibrations of the cochlea affect thousands of nerves which send messages to the brain. The brain recognises these as sounds.