1. Electromagnetic Spectrum Unit D: Earth’s Place in the Universe

2. What is the Electromagnetic Spectrum? Range of all types of radiation Full range of frequencies (from radio waves to gamma rays) that characterize light Stream of mass-less particles (radiation)

3. What is the Electromagnetic Spectrum?

4. Waves f = frequency = wavelength c = speed of light

5. Types of EM Radiation

6. Uses of EM Radiation Wave Type UsesHazards Radio Waves Radio stations, communication, TV Microwaves Cooking, transmitting signals, monitor rain Internal heating of body tissues

7. Uses of EM Radiation Wave Type UsesHazards Infrared Optical fiber, communication, map dust between stars in space Felt as heat, can burn skin Visible Light seeing UV light Detect forged money, sterilization can cause cancer

8. Uses of EM Radiation Wave Type UsesHazards X-Rays Airport security, dentist/doctor images Damage cells, causes cell mutations that can lead to cancer and cell death Gamma Rays Killing cancer cells, allows doctors to see images inside body Damage cells, causes cell mutations that can lead to cancer and cell death