Science 8-Chapter 4—Lesson 2

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Presentation transcript:

Science 8-Chapter 4—Lesson 2 Light

light type of wave called an electromagnetic wave

light source something that emits light

light ray a narrow beam of light that travels in a straight line

transparent a material that allows almost all light that strikes it to pass through and forms a clear image

opaque a material that light does not pass through

translucent a material that allows most of the light that strikes it to pass through but forms a blurry image

refraction a wave that changes direction as it travels from one material into another

reflection light waves come in contact with the surface of a material and bounce off

law of reflection the angle of incidence equals the angle of reflection for a wave

absorption energy from light wave is transferred to matter

transmission light wave travels through a material

echo a reflected sound wave Echo

eardrum a thin membrane that stretches across the ear canal

cochlea a structure in the inner ear

loudness the human sensation of how much energy a sound wave carries

amplitude a measure of the energy in a sound wave

decibel the measuring unit of the loudness of sounds

sonar a system that uses sound waves to locate underwater objects