Waves

Question 1

What do waves transfer

Answer 1

Energy

Question 2

Transverse waves

Answer 2

A wave where the vibrations are right angles to the direction of travel

Question 3

Longitudinal wave

Answer 3

A wave where the vibrations are along the same direction as the direction traveled

Question 4

Examples of transverse waves

Answer 4

Water waves

Electromagnetic radiation

Question 5

When does defraction occur

Answer 5

When waves pass through a gap or around an objects

Question 6

Electromagnetic radiation speed?

Answer 6

Travels at the speed of light 3.0 * 108

Question 7

Refraction occurs when ?

Answer 7

When waves pass from one medium to another

Question 8

What can waves be mad of

Answer 8

Vibrations
Oscillations of particles
Feilds

Question 9

Examples of longitudinal waves

Answer 9

Sound waves

Question 10

Wavelength

Answer 10

Length of one full wave

Question 11

Amplitude

Answer 11

Hight of wave

Represents energy

Question 12

Speed

Answer 12

Distance travelled per unit time

Question 13

Period

Answer 13

Time it takes 1 wave to pass a point

Question 14

Frequency

Answer 14

Number of waves produced per second

Question 15

Wave speed

Answer 15

The distance by a wave per unit time

Question 16

When is the defraction effect greatest

Answer 16

The longer the wavelegth

If the size of the gap same as the wavelegth

Question 17

When are waves slightly defracted

Answer 17

If the size of the gap is much larger than the wavelength

Question 18

Why is it easier to receive radio waves on a hill

Answer 18

Radia waves are longer which means they diffract more

Question 19

Sources of :

Radio waves

Microwaves

Infra red radiation

Visible light

Ultra violet

X - ray

Gamma ray

Answer 19

Radio mast

Magnetron

Hot objects

LED’s

The sun

Collision between high energy objects and a metal target

Radioactive substances

Question 20

Detectors of :

Radio waves

Microwaves

Infra red

Visible light

Ultra violet

X - ray

Gamma ray

Answer 20

Aerial

Water

Thermistor CCD’s

Retina

Fluorescent materials

Photographic film

Geiger Muller tube

Question 21

Use of :

Radio waves

Microwaves

Infrared

Visible

Ultra violet

X ray

Gammma ray

Answer 21

Radio telescope

Mobile phones

Remote controls

Lasers

Security marking

Medical sans

Radio therapy

Question 22

What does wave speed demand on

Answer 22

The medium which it travels through

Question 23

When does light slow down

Answer 23

When it enters a more ense medium

Different mediums cause light to Chang direction

Question 24

Where is the normal of an object

Answer 24

90 degrees to the object

Question 25

What happens when wavelength increases

Answer 25

Frequency decreases Indirectly porportional

Question 26

What does diffraction not effect

Answer 26

Wavelength and frequency

Question 27

What part of the body detect infrared

Answer 27

The skin

Question 28

What does sun screen do

Answer 28

Blocks the ultraviolet from the sun

Question 29

O-zone layer

Answer 29

Stops too much ultra violet getting to the skin

Question 30

X-ray through soft and dense tissues

Answer 30

X-ray passes through soft tissues such as skin and muscle X-ray absorbed by dense tissues such as bones

Question 31

What don’t gamma rays not affect gamma ray sensors

Answer 31

Gamma rays only effect living tissues

Question 32

High frequency waves

Answer 32

Travel in straight lines and don’t follow the cuviture of earth

Question 33

Uses or refraction of light

Answer 33

Telescope | Microscope

Question 34

Why does white light through a prism causes visible light

Answer 34

White light is made up of different coloured. Colours have different frequency

Question 35

Refraction

Answer 35

Wave changes speed when it moves from one medium to another

Question 36

Defraction

Answer 36

When waves - pass a barrier - edge - through a gap It bends around it

Question 37

Pensi in water

Answer 37

Light from air immersed object has to cross the water | This cause ray of light to change direction

Question 38

When does light ben towards the normal

Answer 38

When it goes from less to dense to more dense

Question 39

When does light bend away from the normal

Answer 39

More dense ——> less dense