Electromagnetic Waves

Question 1

What type of waves are electromagnetic waves?

Answer 1

Transverse waves

Question 2

What do all types of electromagnetic waves do the same?

Answer 2

They all travel at the same velocity all at the speed of light in air or a vacuum

Question 3

What are all the sections of the electromagnetic spectrum?

Answer 3

Extends from low frequency to low energy waves to high frequency to high energy waves

Question 4

What does the wavelength of an electromagnetic wave effect?

Answer 4

How it is absorbed

Question 5

What are the uses of radio waves ?

Answer 5

Television radio Bluetooth

Question 6

What are the uses for microwaves?

Answer 6

What satellite communications and cooking food

Question 7

What are the uses for infrared waves ?

Answer 7

Electrical heaters cooking food and infrared cameras

Question 8

What are the uses for visible light

Answer 8

Fibre optic communications and general lighting of rooms

Question 9

What are ultraviolet waves used for?

Answer 9

Energy efficient light bulbs security marking and sunbeds

Question 10

What are x-rays for used for?

Answer 10

Medical imaging and treatments

Question 11

What are gamma rays used for

Answer 11

Sterilising food and treatment of tumors

Question 12

What are features of radio waves?

Answer 12

Radio waves are low energy waves and therefore not home for making them ideal for radio transmission

Question 13

What are features of microwaves

Answer 13

Microwaves travel in straight lines through the atmosphere this makes them ideal for transmitting signals to satellites in orbit and transmitting them back down to the receivers

Question 14

What are features of infrared waves?

Answer 14

electrical heaters grills or toasters and much more glow red hot as the electricity flows through them this transmits infrared energy that is absorbed by the food and converted back into heat

Question 15

What can visible light do in fibre optics

Answer 15

Visible light can travel down optical fibres from one end to the other without being lost through the sides

Question 16

What do ultraviolet waves do

Answer 16

the ultraviolet waves can be in energy efficient light bulbs UV waves are produced by gas in the ball when it is excited by the electric current these UV waves are absorbed by the coating on the bulb which fluresces giving off visible light

Question 17

Why are x-rays perfect for medical imaging and treatments

Answer 17

x-rays are able to penetrate soft tissue but not bone a photographic plate behind the person which Shadows were bones are allows the x-ray to be a lot more clear

Question 18

What can gamma rays be used to do

Answer 18

Gamma rays are the most energetic of all electromagnetic waves and can be used to destroy bacteria and tumours

Question 19

What can radio waves be caused by

Answer 19

Oscillations

Question 20

How is a radio signal produced

Answer 20

The frequency of the radio wave produced matches the frequency of the electrical oscillation

Question 21

What is created when radio waves are absorbed by a conductor

Answer 21

Alternating currents

Question 22

What can resort in em waves are otherwise known as electromagnetic waves

Answer 22

Changes in atoms and the nuclei of atoms

Question 23

What can electrons moving between energy levels as a result of heat or electrical excitation cause

Answer 23

Waves for example infrared waves and visible light ultraviolet and x-ray etc

Question 24

What do ultraviolet waves x-rays and gamma rays carry enough energy to do

Answer 24

Harm the human body

Question 25

How is ultraviolet waves harmful

Answer 25

They can cause the skin to age prematurely and increase the risk of skin cancer

Question 26

How can x-rays and gamma rays harm the human body

Answer 26

x-rays and gamma rays ionising radiation they can damage cells by ionizing atoms and if absorbed by the nucleus of the cell they can cause gene mutations and cancer