Electromagnetic Waves

Question 1

List all the wave in order

Answer 1

Radio
Microwaves
Infrared
Visible light
Ultraviolet 
X-rays
Gamma Rays

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Question 2

Describe the trend going down the waves

Answer 2

Frequency increases

Wavelength decreases

Question 3

Radio waves uses and why it’s useful

Answer 3

Transmit radio and terrestrial tv signals
They can travel long distances before being absorbed
They don’t cause damage if absorbed by human body and can be reflected to change their direction

Question 4

Micro waves uses and why it’s useful

Answer 4

Heating food because most foods have a lot of water molecules that absorb the energy of microwaves causing temp increase
Satellite communication because they can pass through the earths atmosphere without being reflected or refracted

Question 5

Infrared uses and why it’s useful

Answer 5

Emitted by electrical heaters and cook food because it’s easily absorbed by the surface of objects
Infrared cameras to detect people in the dark

Question 6

Visible light uses and why it’s useful

Answer 6

Communication using fibre optics

Optical fibres can then carry phone and cable tv signals

Question 7

Ultraviolet uses and why it’s useful

Answer 7

Energy efficient light bulbs because short wavelength carries more energy than visible light and is then converted to visible light inside the bulb
Sun Tanning but risk of skin cancer

Question 8

X-rays and gamma rays uses and why it’s useful

Answer 8

Medical imaging and treating cancer
X-rays are for broken bones
Gamma rays to detect cancers because they’re very penetrative

Question 9

Radio waves and oscillation

Answer 9

When radio waves are absorbed they may create an alternating current with the same frequency as the radio wave itself so they can induce oscillations in an electrical circuit