Longer waves

1
Longer waves

• Ultraviolet and infrared

2
More in the electromagnetic spectrum!

• If you lie in the sun the electromagnetic
  radiation that falls on your skin includes
• Light
• Infrared radiation
• Ultraviolet radiation

Infrared radiation makes your skin feel
Ultraviolet radiation makes your skin tan but
also causes sunburn. This is not a heat burn,
but is caused by the radiation damaging your
skin. Ultraviolet damage may cause skin cancer.
3
What use are infrared waves?

• Infrared waves produce heat! Quite useful then!

4
What use are ultraviolet waves?

• We cannot see or feel ultraviolet waves but they
  are useful.
• Special security marks are put into bank notes
  and bank cards they only show up under a
  special UV lamp.
• This helps to prove that bank notes and cards
  are not forgeries!

5
Time to test yourself!

• Follow the link to see what you have learnt..
• If youre not sure, go through the slides again.