Q2M1-LESSON-3.3-LIGHT-INTERACTION-WITH-MATTER.pptx

Light interaction with matter involves several processes that describe how light behaves when it encounters different materials. These interactions include absorption, reflection, refraction, scattering, and transmission. When light is absorbed, the energy from the light is taken up by the material, often leading to heat or causing chemical changes. In reflection, light bounces off the surface of an object, allowing us to see it. Refraction occurs when light passes through a medium and bends due to a change in speed. Scattering happens when light hits small particles, causing it to spread in different directions. Lastly, transmission refers to light passing through a material without significant alteration. These interactions play a critical role in understanding various natural phenomena and in the development of technologies like lenses, lasers, and fiber optics.

1. are waves that can travel in any medium and in a vacuum. Speed in vacuum : 3 x 10 8 m/s

2. Frequency is measured in hertz (Hz) . Wavelength is measured in nanometer (Hz) .

3. EM waves are arranged in order of decreasing wavelength.

4. Wavelength and Frequency of Colors of Light Color Wavelength (nm) Frequency (Hz) Violet 410 7.32 x 10 14 Indigo 445 6.74 x 10 14 Blue 470 6.38 x 10 14 Green 550 5.45 x 10 14 Yellow 590 5.08 x 10 14 Orange 610 4.92 x 10 14 Red 760 3.95 x 10 14

5. Each color of light corresponds to a certain amount of energy . This energy is dependent on the frequency of light .

6. Scattering of light happens when particles of a medium interact with light , causing the latter to be in many directions.

7. Reflection is the turning back of light into the same direction after striking a surface.

8. Refraction of light is the bending of light when it passes from one medium to another at different speeds.

9. Greater refractive index means greater bending of light.

10. Absorption of light takes place when light transfers some or all of its energy to the medium.

11. Transmission of light occurs when light passes through a material where some or none of its energy is being absorbed.