Light
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Light is responsible for photosynthesis and indirectly produces oxygen. It heats the ocean, air and land, initiating weather patterns and partly causing ocean currents and the water cycle. Light displays properties of waves as it reflects, diffracts, and refracts. It is an electromagnetic wave that propagates without a medium and has a velocity, wavelength, and frequency. The electromagnetic spectrum includes invisible forms of light like gamma rays and radio waves. In the visible spectrum, color is the reflected light wavelength, while white light is a combination of all visible wavelengths.
Light
- 1. Light Characteristics, velocity, frequency, wavelength, The Electromagnetic Spectrum, Colors
- 2. Light Significance of Light Responsible for photosynthesis Indirectly responsible for production of Oxygen tesCarbohydraOCOOH 222 Sunlight
- 3. • Heats up ocean, air, and land which initiates different weather patterns • Partly responsible for ocean currents • Partly responsible for evaporation and condensation of rain.
- 4. Light is a Wave Light is a wave because it displays some properties of mechanical waves. It reflects. (Reflection) It diffracts. (Diffraction) It refracts. (Refraction.
- 5. Light as Electromagnetic Wave • Light can propagate without the existence of physical medium (solid, liquid, gas) • Light has velocity, wave length, and frequency. • Light is made up of “Many Light Waves”. Invisible Light Invisible Light Gamma Rays X-Rays Ultraviolet rays Infrared rays Microwaves Radio waves High Frequency, short wave length Low Frequency, Long wavelength
- 7. Each light wave in the electromagnetic spectrum carries different Frequency and Wave Length, but their VELOCIY is the SAME. 300000km/slight)ofv(speed frequencyf lengthwave velocity v fv
- 8. Color Visible Light (light with colors) – represent a band of light waves whose wavelength is between 380 nm – 739 nm. Monochromatic light – a light wave of one wavelength Colors – The light ray which is reflected.
- 9. White Light is the combination of all visible light. White – is not a color. Black – is also not a color. (No visible light is reflected. Different organisms are sensitive to different wave lengths. Snakes, and crocodiles – can see the red to infrared color
- 10. Humans, and primates are sensitive to green colors Bats – sensitive to infrared light
- 11. Human Eye Retina – inside surface of the pupil. Collections of cells which are responsible for light detection. Rods – Sensitive to the intensity of light Cones – Sensitive to the wavelengths of visible light.
- 12. Cone Sensitivity Curve Why are primates (humans, monkeys, apes) sensitive to green?
- 13. Colors – the color we see is the reflected light of ROYGBIV
- 14. Properties of Objects in Relation to Light Transparent – light passes straight through the object Translucent – some light passes through, some are reflected, some are refracted (scattered into many directions) Opaque – no light passes through the object.