P13

Question 1

WHAT ARE THE PURPOSE OF ELECTROMAGNETIC WAVES?

Answer 1

They travel and transfer energy from one source to another

Question 2

WHAT ARE ELECTROMAGNETIC WAVES?

Answer 2

made up of oscillating electric and magnetic fields

Question 3

WHAT TYPE OF WAVE ARE ELERCTROMAGNETIC WAVES/

Answer 3

transverse waves

Question 4

AT WHAT SPEED DO ELECTROMAGENTCI WAVES TRAVEL THROUGH A VACUUM?

Answer 4

3 x 10>8 m/s

Question 5

LIST THE ELECTROMAGNETIC SPECTRUM

Answer 5

radio-waves
microwaves
infrared waves
visible light waves
ultra violet rays
x- rays
gamma rays

Question 6

WHAT HAPPENS TO THE PROPERTIES OF THE ELERCTROMAGNETIC WAVES AS THEY DESCENED DOWN SPECTRUM?

Answer 6

Wavelength decreases and frequency increases

Question 7

GIVE ONE USE OF RADIOWAVES

Answer 7

Used to transmit radio using transmitter and reciever
generated by alternating current

Question 8

GIVE THE TWO DIFFERENT WAYS MICROWAVES CAN BE DIFFERENTIATED

Answer 8

Absorbed by water molecules
NOT absorbed by water molecules

Question 9

GIVE THE USES OF MICROWAVES

Answer 9

ones absorbed by water can be used in microwave ovens
ones NOT absorbed can be used in satellite communication

Question 10

INAFRED WAVES ARE…

Answer 10

emitted from all objects

Question 11

WHAT DISTIGUISHES HOW MUCH INFARED AN OBJECT EMITS….

Answer 11

how hot the object is

Question 12

GIVE TWO USES OF INFARED WAVES

Answer 12

-Can be used in cameras to detect animals (infrared cameras)
-Ovens, infrared waves heats metal and metals re emit infrared to cook food

Question 13

VISIBLE LIGHT IS…

Answer 13

the only waves our eyes can see

Question 14

WHITE LIGHT IS?

Answer 14

A mixture of all light waves

Question 15

WHY DO WE SEE COLOURS AS DIFFERENT COLOURS?

Answer 15

Because all colours have different wavelengths therefore reflect off different things

Question 16

WHEN WE GO RED TO VIOLET WHAT HAPPENS?

Answer 16

Wavelength decrease’s

Question 17

WHAT IS ULTRAVIOLET GENERATED BY?

Answer 17

The sun

Question 18

GIVE TWO USES OF ULTRAVIOLET WAVES?

Answer 18

• Security to reveal invisible fingerprints and writing
  -Sunbeds for artificial tan

Question 19

WHAT IS THE DANGER OF ULTRAVIOLET WAVES?

Answer 19

They can be ionising and cause sunburn and skin cancer

Question 20

WHAT ARE X-RAYS?

Answer 20

X-rays are electromagnetic waves used to make images of bones to check for fractures

Question 21

HOW ARE X-RAYS USED IN MEDICINE?

Answer 21

pass through soft tissue but absorbed by bones so you can view internal structure

Question 22

HOW DO WE X-RAY ORGANS?

Answer 22

as organs are soft tissue and do not absorb x- rays we fill it with a contrast medium

Question 23

HOW ARE X- RAYS DANGEROUS?

Answer 23

they are ionising and can damage living tissue cells when they pass through

Question 24

HOW ARE GAMM RAYS USED?

Answer 24

• Sterilisation of medical equipment, kill microorganism
  -Keep food fresh for longer

Question 25

HOW DO GAMMA RAYS WORK?

Answer 25

when they travel through substance they knock electrons out of atoms forming positive ions so they can be ionising hence used in radio therapy to kill cells