waves

Question 1

What do waves do?

Answer 1

Transfer energy without transferring matter.

Question 2

Longitudinal waves

Answer 2

Waves in which the vibrations are parallel to the direction of energy transfer

Question 3

Transverse waves

Answer 3

Waves in which the vibrations are perpendicular to the direction of energy transfer.

Question 4

Electromagnetic waves can travel through what

Answer 4

Can travel through a vacuum, no medium is needed

Question 5

Examples of electromagnetic waves

Answer 5

light, radio, micro

Question 6

Example of longitudinal waves

Answer 6

Sound

Question 7

Amplitude

Answer 7

Height of the wave crest.

Question 8

The bigger the amplitude of the waves…

Answer 8

…. the more energy the waves carry.

Question 9

Examples of Transverse waves

Answer 9

light, radio, micro

Question 10

Wavelength

Answer 10

The distance from one wavelength to the next

Question 11

Frequency

Answer 11

The number of wave crests passing a fixed point every second

Question 12

Electromagnetic Spectrum

Answer 12

Smallest - Largest:
Gamma
X-ray
Ultraviolet
Visible
Infrared
Micro
Radio

Question 13

Reflection

Answer 13

Law of reflection the angle of incidence is equal to the angle of reflection
The speed of the wavelength depends on the material it travels along

Question 14

Refraction

Answer 14

The wave changes speed when going into the glass
When a wave reaches a boundary and goes into a different medium it’s speed changes
If the speed of a wave becomes smaller then the distance between wavefronts becomes shorter
Therefore the wave changes directions bends it retracts

Question 15

Desperation of light

Answer 15

Light entering a prism is refracted
Different colours, wavelengths will refract at different angles
Red colour bends less than blue or violet
Richard of your gave battle in vain

Question 16

Totally internally reflected

Answer 16

When light from a medium with a bigger optical density it hits the boundary at an angle bigger than the crtial angle then it is totally internally reflected 


Question 17

Dopple effect

Answer 17

s the change in frequency due to a wavefront moving closer
A wavefront becomes closer so the wavelength decreases.
Since the wave speed is at a constants the frequency higher
The sound has a high pitch
Wavelength increases
Frequency decreases

Question 18

The hotter an object is…

Answer 18

… The more infrared radiation it emits.

Question 19

How does infrared radiation affect the body?

Answer 19

It can damage or kill skin cells by heating them up.

Question 20

Optical fibres

Answer 20

The glass fibre used to send light signals along.

Uses infrared radiation.

Question 21

4 uses of infrared radiation

Answer 21

Optical fibres
remote control handsets
infrared scanners
infrared handsets

Question 22

The shorter the length of radio waves:

Answer 22

The more information they can carry.
The shorter their range.
The less they spread out.

Question 23

What are microwaves used for?

Answer 23

Satellite phones
TV links
Satellite TV
produced by microwaves to cook food

Question 24

What are radio waves

Answer 24

TV broadcasting

Question 25

What do electromagnetic waves carry

Answer 25

Information

Question 26

What effect/harm does UV radiation have?

Answer 26

It is harmful to human eyes and can cause blindness.

Question 27

What produces gamma rays?

Answer 27

Radioactive substances when unstable nuclei release energy.

Question 28

Can sound waves travel through a vacuum?

Answer 28

no

Question 29

Loud and High Pitched

Answer 29

high and close together

Question 30

Loud and Low Pitched

Answer 30

high and spaced out

Question 31

Increasing the loudness of a sound...

Answer 31

.. Increases its amplitude.

Question 32

Increasing the frequency of a sound...

Answer 32

...Increases its pitch.

Question 33

Positives of ultrasound

Answer 33

Non-ionising Produces images of organ tissues as well as bones

Question 34

What is the use of UV radiation?

Answer 34

produced by tanning bed lights to tan skin used to detect conterfeit money used to clean water

Question 35

Give three properties (features) common to all EM waves

Answer 35

They all... travel at the speed of light all transverse waves all transfer energy and information without transferring matter all travel through a vacuum

Question 36

List the EM spectrum in order of decreasing frequency

Answer 36

Gamma - gardens X-ray - expensive UV - unusual Visible - very IR - in Microwave - mate Radio - rabbits

Question 37

What is the relationship between wavelength and frequency of a wave?

Answer 37

As frenqucy increases the wavelength decreases They are inversely proportional

Question 38

What is the use of X-rays?

Answer 38

Used to detect breaks in bones used to detect crystal structure in salts