Waves And Sound

Question 1

What are sound waves caused by

Answer 1

Vibrating objects

Question 2

What are the vibrations in a sound wave passed through a medium as

Answer 2

Series of compressions and rarefactions

Question 3

How does a sound wave pass through a solid

Answer 3

By causing the particles in the solid to vibrate

Question 4

What type do wave is a sound wave

Answer 4

A longitudinal wave

Question 5

Why can’t sound travel through space

Answer 5

Is mostly a vacuum so there are no particles to move or vibrate

Question 6

When will you hear sound

Answer 6

When your ear drum vibrates by the sound waves

Question 7

What are the vibrations from your ear drum passes onto

Answer 7

Tiny bones called ossicles, through the semicircular canals and to the cochlea

Question 8

What does the cochlea do to the vibrations

Answer 8

Turns them into electrical signals which get sent to your brain and allow you to sense the sound

Question 9

What range can humans hear in

Answer 9

20 hertz to 20 kilohertz

Question 10

What are echoes

Answer 10

Reflected sound waves

Question 11

What happens to sound wave when they enter a different media

Answer 11

They will refract
In a denser material they speed up
It’s wavelength will change but it’s frequency remains the same so it’s speed mush also change

Question 12

What frequency do ultrasounds have

Answer 12

Higher than 20000Hz

Question 13

What is partial reflection

Answer 13

When a some of a wave is reflected off a boundary between two mediums and some is transmitted

Question 14

What can you do with partial reflection and ultrasound

Answer 14

You can point a pulse of ultrasound at an object and wherever the boundaries are between a substance and another substance some of the ultrasound will be reflected back
The time it takes for the reflection to reach a detector can be used to measure how far away a boundary is

Question 15

What happens to ultrasound though a body

Answer 15

It can pass straight though but when they reach a boundary between two different media some of the wave is reflected back

Question 16

How does a computer produce a video image of a foetus

Answer 16

They process the exact timing and distribution of echoes which are reflected by the ultrasound waves passing though the body

Question 17

What can ultrasound be used for

Answer 17

To find flaws in objects such as pipes or wood and metals

Video imaging of babies

Question 18

How can ultrasound detected cracks

Answer 18

They will be relegated usually by the far side of the material so if there is a crack they will reflect earlier

Question 19

What is echosounding

Answer 19

It uses high frequency sound waves ( like uktrasound) to find the depth of water they are in or to locate objects in deep water

Question 20

What causes seismic waves

Answer 20

Earth quakes and explosions

Question 21

What detect seismic waves

Answer 21

Seismometers

Question 22

What do seismologists do

Answer 22

Work out the time it takes for the shock waves to reach each seismometer and note which sorts of the earth don’t receive the shock waves at all

Question 23

What happens to the Path of a wave when a wave is refracted

Answer 23

The wave will change speed gradually and result in a curved path
Is the properties change suddenly the wave speed changed antibiotic and the oath has a Kink

Question 24

What have scientists been able to do by observing how seismic waves are absorbed and refracted

Answer 24

Work out where the properties of the earth change dramatically

Question 25

What are the 2 types of waves

Answer 25

P waves

S waves

Question 26

What type of wave can travel through the earths core

Answer 26

P waves

Question 27

Properties of P waves

Answer 27

Longitudinal
Travel through solids and liquids
Travel faster than S waves

Question 28

What are the properties of S waves

Answer 28

They are transverse
Can’t travel through liquids and gases
Slower than P waves