1. Electromagnetic Spectrum

2. What is the EM Spectrum?
All the Types of Radiation we receive from the sun and other sources, including visible light
Radiation is energy
How does energy travel?
In Waves!!!

3. WAVELENGTH is just as it sounds….. The LENGTH of a WAVE
WAVES – Wavelength and Frequency
WAVELENGTH is just as it sounds….. The LENGTH of a WAVE
FREQUENCY is how many waves per second

4. Wavelength and the EM Spectrum
The different wavelengths of the EM spectrum correspond to the different types of waves and the different energies that each has

5. Visible light is a small part of the EM Spectrum
Ranges from about nm

6. Visible Light and The EM Spectrum

7. The Colors of Visible Light: ROYGBV
nm — wavelength of violet light
nm — wavelength of blue light
nm — wavelength of green light
nm — wavelength of yellow light
nm — wavelength of orange light
nm — wavelength of red light

8. All objects give off some form of radiation
It may take millions or even billions of years to get here
The different types of radiation differ in wavelength, frequency, and energy
Some forms may be too weak for us to be able to detect
Radio waves are a good source of radiation that we can study

9. Wave Type Wavelength (Size) Frequency (How many) Energy (EV)
RADIO WAVE
102 m
(soccer field)
106 per second
10-9 EV
MICROWAVE
10-1 m
(baseball)
109 per second
10-5 EV
INFRARED
10-5 m
(cell)
1013 per second
10-1 EV
VISIBLE LIGHT
10-6 m
(bacteria)
1014 per second
1 EV
ULTRAVIOLET LIGHT
10-7 m
(virus)
1015 per second
101 EV
X-RAYS
10-8 – m
(water molecule)
1016 – 1019 per second
Up to 105 EV
GAMMA RAYS
Less than m
(atoms)
Over 1020 per second
Over 106 EV

11. Things to Know / Study for your upcoming quiz:
How long ago did the Big Bang happen and how long ago was the earth created? How do we know this?
What is the evidence for the Big Bang?
How do we know the Universe is expanding – What is the evidence?
How do we gather data about the age and composition of astronomical objects?