Light, infrared radiation and radio waves Flashcards Preview

GCSE Physics: Topic 13 > Light, infrared radiation and radio waves > Flashcards

Flashcards in Light, infrared radiation and radio waves Deck (19):
1

How is visible light detected?

By our eyes

part of the electromagnetic spectrum

2

How can we see different colours with visisble light?

Seeing different wavelengths

3

What happens going from violet to red

visibile light spectrum?

Wavelength increases across

4

What is the mixture of all the colours

visible light spectrum?

White light

5

What is an important skill for photography?

Using different shades and colours within visible light

6

What is infrared radiation emitted from?

All objects

7

What happens the hotter the object is?

More infrared radiation it emits

8

Remote controls for devices such as TVs and DVD players use?

Infrared radiation (IR)

9

What can infrared radiation be transmitted along?

Optical fibres

10

What is infrared radiation used in?

Special camers that allow people to see in dark

11

Where are microwaves used in?

Communications

12

What do microwave transmitters produce?

Wavelengths that are able to pass through the atmosphere

13

Another purpose for microwaves?

  • Used to sned signals to and from satellites for TV programs
  • Microwaves are also used in microwave ovens for heating food

14

What are radiowaves used to?

Transmit radio and TV programmes

15

What type of radiation do mobile phones used?

Use microwave radiation and radio waves 

16

How is microwave radiation and radio waves hazardous

Penetrate your skin and absorbed by body tissue

causing internal heating and damage

17

Infrared radiation

how is it hazardeous?

Absorbed by skin and too much causes you to get burnt

18

Experiment to see better emitter of infrared radiation

  • Cans with light surface and can with black surface
  • Fill can with hot water with same temp
  • Leave can for same time
  • Can with low temp , best emitter

19

Expierment to test best absorber of IR

  • Can with shiny surface , can with black surface
  • fill can with same volume of water , same temp
  • Place can in sunlight for same time
  • Measure temp
  • Can with hightest temp is absober