The Invisible Universe Sources & Detectors of Invisible Light Insert Your Name Here

Electromagnetic Spectrum The full range of frequencies, from radio waves to gamma rays, that characterizes lightfrequencies The electromagnetic spectrum can be expressed in terms of energy, wavelength, or frequency. Each way of thinking about the EM spectrum is related to the others in a precise mathematical way.electromagnetic spectrum The wavelength equals the speed of light divided by the frequency.wavelengthspeed of lightfrequency

Electromagnetic Radiation Electromagnetic radiation can be described in terms of a stream of photons, each traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy.lectromagnetic radiationphotonsspeed of light The only difference between radio waves, visible light, and gamma-rays is the energy of the photons. Radio waves have photons with low energies, microwaves have a little more energy than radio waves, infrared has still more, then visible, ultraviolet, X-rays, and gamma-rays.RadiomicrowavesinfraredvisibleultravioletX-rays gamma-rays

Wavelength and Frequency For any kind of wave there exists a simple relationship between wavelength and frequency. The wavelength is measured as the distance between two successive crests in a wave. The frequency is the number of wave crests that pass a a given point in space each second.

Understanding Waves The traditional “slinky lab” as well as other activities to help understand waves. An activity that allows students to experiment with waves-longitudinal and transverse. Activity #1: Comparing Wave Makers is a good activity to highlight this concept.

Radio (Low Frequency & Very High Frequency) Emitted by –Astronomical Objects –Radio Station transmitters Detected by –Ground based radio telescopes –Radios

Microwave Emitted by: –Gas clouds collapsing into stars –Microwave Ovens –Radar Stations –Cell Phones Detected by –Microwave Telescopes –Food (heated) –Cell phones –Radar systems)

Infrared (Near and Thermal) Emitted by –Sun and stars (Near) –TV Remote Controls –Food Warming Lights (Thermal) –Everything at room temp or above Detected by –Infrared Cameras –TVs, VCRs, –Your skin

Visible Emitted by –The sun and other astronomical objects –Laser pointers –Light bulbs Detected by –Cameras (film or digital) –Human eyes –Plants (red light) –Telescopes

Ultraviolet Emitted by –Tanning booths (A) –The sun (A) –Black light bulbs (B) –UV lamps Detected by –Space based UV detectors –UV Cameras –Flying insects (flies)

X-ray Emitted by –Astronomical objects –X-ray machines –CAT scan machines –Older televisions –Radioactive minerals –Airport luggage scanners Detected by –Space based X-ray detectors –X-ray film –CCD detectors

Gamma Ray Emitted by –Radioactive materials –Exploding nuclear weapons –Gamma-ray bursts –Solar flares Detected by –Gamma detectors and astronomical satellites –Medical imaging detectors

Sources of Gamma-ray Emission Black holes Active Galaxies Pulsars Diffuse emission Supernovae Gamma-ray bursts Unidentified

Source/Detector Activity Students identify sources (emitters) and detectors of the various wavelengths of the EMS. Students also have the opportunity to experiment with shields –or types of materials that prevent the transmission of wavelengths.

What did we learn? Question: What property of the materials we tested caused radio waves to be blocked? Question: Are all the plastics we tested translucent/transparent to infrared light? Question: If someone had no sunscreen while at the beach what could they cover their face with to keep from getting sun burned by UV light?

Exploring the EMS with NASA Missions ASTRO-E2 Chandra CHIPSCon-X GALEX GLAST HETE-2 INTEGRAL MAP RXTE SWAS XMM-Newton Swift Energy (eV) RadioInfraredVisibleUVX-rayGamma ray

And the universe for that matter!

Windows through Atmosphere

The GEMS Guide A workbook and teachers guide inspired by the Swift mission and developed in collaboration with the GEMS Program. Activities in this book: Activity 1: Comparing Wave Makers Activity 2: Invisible Light Sources and Detectors Activity 3: Putting the Electromagnetic Spectrum Together Activity 4: Tour of the Invisible Universe Activity 5: The Most Powerful Explosions in the Universe

Source of Activities GEMS Guide: The Invisible Universe. – multiwavelength_astronomy/multiwavelength_museum /sun.htmlhttp://coolcosmos.ipac.caltech.edu/cosmic_classroom/ multiwavelength_astronomy/multiwavelength_museum /sun.html Add other links as needed.

More Information Swift - GLAST – XMM Newton - NASA SSU – Space Mysteries –