Electromagnetic radiation consists of transverse waves produced by electrically charged particles that transfer energy through photons. All electromagnetic waves travel at the same speed but have varying frequencies and wavelengths, ranging from radio waves to gamma rays on the electromagnetic spectrum. The type of matter determines whether it absorbs, reflects, or transmits light, with opaque materials blocking all light, translucent materials partially transmitting light, and transparent materials fully transmitting light.

1. Electromagnetic Radiation

2. Electromagnetic Radiation- transverse waves produced by the motion of electrically charged particles. The transfer of electromagnetic waves is called radiation.

3. Photons- tiny bundles of radiation. All wave travel at the same speed (3 X 10 8 or 300,000,000 m/s) but the frequency and wavelength varies.

4. Electromagnetic Spectrum Radio waves Infrared Visible Light Ultraviolet X-rays Gamma Rays *Radio waves include microwaves and cell phones.* -Increasing frequency -Increasing photons -Decreasing wavelengths

5. As you go from radio to gamma rays, there are more waves. Wavelength also decreases and frequency increases.

6. The type of matter determines the amount of light it absorbs or reflects. Opaque Translucent Transparent

7. Opaque – material that absorb or reflect all light so you can’t see through it. Translucent - material that allow some light to pass through so you can’t clearly see through it. Transparent- material that allow all light to pass through so you can clearly see through it.

8. Transparent Ex: Glass or Transparency Translucent Ex: Plastic or waxed paper Opaque Ex: Walls, doors or you