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Carries audio for T.V. Broadcasts

Longer wavelength so can bend around hills

FM frequency modulation

Carries video for T.V. Broadcasts

2000 Microsoft Clip Gallery

Slide 12

Short Wavelength Microwave

Short Wavelength Microwave

Invisible Spectrum (Cont.)

Infrared Rays

Def Light rays with longer wavelength than red light.

Uses: Cooking, Medicine, T.V. remote controls

Slide 13

Electromagnetic Spectrum

Electromagnetic Spectrum

Invisible spectrum (cont.).

Ultraviolet rays.

Def. EM waves with frequencies slightly higher than visible light

Uses: food processing & hospitals to kill germs cells

Helps your body use vitamin D.

Slide 14

Electromagnetic Spectrum

Electromagnetic Spectrum

Invisible Spectrum (Cont.)

X-Rays

Def. - EM waves that are shorter than UV rays.

Uses: Medicine Bones absorb x-rays; soft tissue does not.

Lead absorbs X-rays.

Slide 15

Electromagnetic Spectrum

Electromagnetic Spectrum

Invisible spectrum (cont.)

Gamma rays

Def. Highest frequency EM waves; Shortest wavelength. They come from outer space.

Uses: cancer treatment.

Slide 16

Light: Particles or Waves?

Light: Particles or Waves?

Wave Model of Light

Explains most properties of light

Particle Theory of Light

Photoelectric Effect Photons of light produce free electrons

2000 Microsoft Clip Gallery

Slide 17

Light: Refraction of Light

Light: Refraction of Light

Refraction Bending of light due to a change in speed.

Index of Refraction Amount by which a material refracts light.

Prisms Glass that bends light. Different frequencies are bent different amounts & light is broken out into different colors.

Slide 18

Refraction (Cont.)

Refraction (Cont.)

Slide 19

Refraction-Spectroscope Lab

Refraction-Spectroscope Lab

Hey girls! The filters go on the Spectroscope, not on the lashes!

2000 D. L. Power

Slide 20

Color of Light

Color of Light

Transparent Objects:

Light transmitted because of no scattering

Color transmitted is color you see. All other colors are absorbed.

Translucent:

Light is scattered and transmitted some.

Opaque:

Light is either reflected or absorbed.

Color of opaque objects is color it reflects.

2000 Microsoft Clip Gallery

Slide 21

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