The Electromagnetic Spectrum. Electromagnetic Spectrum Definition: It is a range of all types of...
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Transcript of The Electromagnetic Spectrum. Electromagnetic Spectrum Definition: It is a range of all types of...
Electromagnetic Spectrum
• Definition: It is a range of all types of electromagnetic radiation
• Nickname: EMS
But what is radiation?
• Radiation is: Energy that travels throughout space (even around us)
• Video
Wavelength• Electromagnetic
Radiation can have different wavelengths
• Wavelengths tell us what type of radiation (energy) it is
• Short wavelengths have the most energy, and as the wave length get longer, the energy decreases
Wavelength
Short wavelengths• Lots of energy• Examples: Gamma rays
and x-rays
Long Wavelengths• Less energy• Examples: Radio and
Microwaves
Electromagnetic Spectrum and Space
• The electromagnetic spectrum (EMS) helps scientists study far away places in the universe and their movement in relation to the Earth
Electromagnetic Spectrum and Space
• Most stars emit light rays (visible light) which allows us to measure light years
• Radio waves help us explore space (radio telescope)
Electromagnetic Spectrum and Space
• Microwaves help us determine how far away galaxies are.
• Cosmic Microwave Radiation found in the universe helps support the Big Bang Theory
Electromagnetic Spectrum and Space
• EMS also helps us identify what elements stars are made of
• Each element on the periodic table absorbs light at different wavelengths creating a “fingerprint” on the EMS
• Black lines show us the fingerprint• Example of a “fingerprint” for Hydrogen