P6 - Waves

Question 1

What are transverse waves

Answer 1

The vibrations are perpendicular ( at right angles ) to the direction of energy transfer

Question 2

What are longitudinal waves

Answer 2

Vibrations are in the same direction as the energy transfer

Question 3

Example of longitudinal wave

Answer 3

Sound wave

Question 4

Example of transverse wave

Answer 4

Light , waves on a string

Question 5

What is the amplitude

Answer 5

Maximum displacement of a point on the wave from its undisturbed position

Question 6

What is wavelength

Answer 6

Distsnce between one point of the wave and the same point on the next one

Question 7

What is the frequency

Answer 7

Number of complete waves passing a certain point per second

Question 8

What is period

Answer 8

Period is the amount of time it takes for one complete wave to pass a certain point

Question 9

How do you find out wave speed

Answer 9

Frequency x wavelength

Question 10

What is the wave speed

Answer 10

Speed at which energy is being transferred through the medium

Question 11

What is a refraction

Answer 11

When a wave crosses a boundary between two materials it can change direction

Question 12

When are waves refracted

Answer 12

Only if they meet the boundary at an angle

Question 13

What are rays

Answer 13

Rays are straight lines that show the direction a wave ia travelling in

Question 14

What type of waves are EM

Answer 14

transverse waves

Question 15

What do electromagnetic waves do

Answer 15

Transfer energy from a source to an absorber

Question 16

Example of campfire -electromagnetic wave

Answer 16

A camp fire is a source.
It transfers energy to its surroundings by giving out infrared radiation.
Infrared radiation is a type of EM wave.
Infrared waves are absorbed by objects

Question 17

Continous spectrum of EM waves low to high frequency

Answer 17

Radio waves
Micro waves
Infra red
Visible light
Ultra violet
X rays
Gamma rays

Question 18

If an EM wave has a high frequency it has a

Answer 18

Short wavelength

Question 19

What are radio waves used for

Answer 19

Radio and TV signals can be sent by radio waves
Very short wavelength used for radio and TV
Longer wavelength radio waves travel further - used to send signala around the world

Question 20

What are microwaves used for

Answer 20

Communication with satellites uses microwaves e.g. for satellite TV and satellite phones
Microwave ovens use microwaves to cook food

Question 21

What is infrared radiation

Answer 21

Infrared cameras detect IR radiation and create a picture.Useful for when seeing where ahouse is loaing energy.

Infrared radiation also used to heat things up.Electric heaters release lots of IR radiation to warm a room

Question 22

What is visible light used for

Answer 22

Optical fibres are thin or plastic tubes that can carry data over long distsnces.Information sent as light rays

Question 23

How are x tays and gamma rays used

Answer 23

X rays pass easily through flesh but not through bones.Can be used to make an X ray image to check for broken bones
Gamma rays used to kill cells, can be sued to treat cancer

Question 24

What is an oscilloscope

Answer 24

Measure the speed of the sound