1. 06 / Wednesday
Kaupapa
Describe the characteristics of seven types of Electromagnetic Radiation from the Sun

2. Do you remember?
What is radiation?

3. Radiation is “transfer of energy”. It is also called wave.
Examples:
Mexican wave
Water ripples
Earthquake
Radio wave from a radio transmitter

6. Seismic (Earthquake) Waves

7. The Radiations from the Sun

8. Practical: Focusing the Sun’s radiation

9. The Seven types of Electromagnetic Radiation
The sun sends tremendous amounts of energy towards the Earth in the form of “Electromagnetic Radiation”.
There are seven different types of EM Radiation.

10. Description / Everyday use
Electromagnetic Radiation
Name
Frequency Range
(Hz)
Wavelength
(m)
Description / Everyday use
Radiowave
3 kHz ~ 300 MHz
1 mm ~ 100 km

11. Frequency & Wavelength

12. Frequency: how many times the wave oscillates in one second
Wavelength: the length of one complete waveform

13. Why is it called Electromagnetic Radiation?

15. Radio Wave
f = 3 kHz ~ 300 MHz
λ = 100 km ~ 1 mm

17. Micro Wave
f = 300 MHz ~ 300 GHz
λ = 1 m ~ 1 mm

19. Infrared
f = 300 GHz ~ 400 THz
λ = 1 mm ~ 750 nm

22. Visible Light
f = 400 THz ~ 770 THz
λ = 750 nm ~ 390 nm

24. Ultra violet (UV)
f = 770 THz ~ 30 PHz
λ = 390 nm ~ 10 nm

26. X-ray
f = 30 PHz ~ 30 EHz
λ = 10 nm ~ 0.01 nm

29. Gamma ray
f = higher than 30 EHz
λ = shorter than 0.01 nm

30. The Seven types of EM Radiations
Radiowave
Microwave
Infra-Red
Visible Light
Ultra Violet
X-ray
Gamma Ray

31. What have we learnt today?
What are the names of the seven Electromagnetic Radiations?