Electromagnetic Spectrum

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!!!

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

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

Visible light is a small part of the EM Spectrum Ranges from about 400-700 nm

Visible Light and The EM Spectrum

The Colors of Visible Light: ROYGBV 380-440 nm — wavelength of violet light 440-520 nm — wavelength of blue light 520-565 nm — wavelength of green light 565-590 nm — wavelength of yellow light 590-625 nm — wavelength of orange light 625-740 nm — wavelength of red light

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

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 – 10-11 m (water molecule) 1016 – 1019 per second Up to 105 EV GAMMA RAYS Less than 10-11 m (atoms) Over 1020 per second Over 106 EV

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?