Sound waves

What type of waves are sound waves

Longitudinal waves

What happens when sound waves move through the air

The air particles vibrate from side to side passing from one medium to another eg air to solid

What happens when sound waves hit the cone in a microscope

It causes it to vibrate which then causing microscope to convert it to electrical signals

How does a sound wave travel though the air

When a sound wave hits a solid object the air particles hitting the object causes the particles in the solid to move back and forth.These particles hit the next particle in line and so on-passing the sound wave through the object as a series of vibrations

How does the ear hear sound

1)Sound waves are funnelled into the air where they hit the ear drum which is a thin membrane

2)This caused the ear drum and other parts of the inner ear to vibrate

3)These vibrates are passed on to tiny bones called ossicles through canals and to the cochlea

4)Cochlea turns vibrations to electrical signals which get sent to your brain by auditory nerve and allow you to sense(hear) the sound

What’s the normal human hearing frequency range

From 20Hz to 20,000Hz

Frequencies out of human hearing range…

May not be able to cause the eardrum to vibrate

Why do sound waves travel faster in solids than gases

The is because particles in solids are much closer together meaning that vibrations can pass more easily between them

Why doesn’t the frequency change as waves change medium

As waves would have to be destroyed or created at the boundary and that’s not possible

Why can’t sound travel in space

As it’s mostly vaccum(there are no particles to move or vibrate)

True or false waves travel faster in liquids than solids

True

How can we view the features of sound waves

-By connecting a microphone to a cathode ray oscilloscope

What does a cathode ray oscilloscope represent sound waves as and why is this a problem

As Transverse waves, this is bad as sound waves are longitudinal

What type of frequency do high pitches have and low pitches

High pitches have a high frequency

Low pitches have a low frequency

A quiet sound has what type of amplitude and a loud sound has what type of amplitude

Quiet sound = Small amplitude

Loud sound = High amplitude

Why can sound waves only move through a medium e.g air to sound

As sound waves move by particles vibrating so cannot pass through a vaccum

What are reflected waves called

An echo

Why do sound waves speed up when they enter a denser material

As when wave travels into a different medium its wavelength changes but frequency remains the same so speed changes