Light presentation
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Light travels very fast in straight lines. We see objects because they reflect light into our eyes, forming shadows where light is blocked. Reflection follows the law that the angle of incidence equals the angle of reflection. Sound travels slower than light and we hear things when they vibrate at different frequencies and amplitudes. The ear contains structures like the eardrum, bones and cochlea that help detect and process sound vibrations.
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1) Light travels in straight lines and much faster than sound. We see objects because they reflect light into our eyes, and shadows are formed when light is blocked.
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1) Light travels in straight lines and much faster than sound. We see objects because they reflect light into our eyes, and shadows are formed when light is blocked.
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1) Light travels in straight lines and much faster than sound. We see objects because they reflect light into our eyes, and shadows are formed when light is blocked.
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1) The document discusses key concepts of light including its properties, reflection, refraction, total internal reflection, and optical fibers.
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Light
Light travels extremely fast at around 300,000 km/s. It travels in straight lines and we see objects because they reflect light into our eyes. There are two types of reflections - clear reflections from smooth surfaces and diffuse reflections from rough surfaces which scatter light in different directions. White light is made up of all the colors of the rainbow, and objects appear a certain color because they reflect only certain wavelengths of light while absorbing others.
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In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. ... Like all types of EM radiation, visible light propagates as waves. However, the energy imparted by the waves is absorbed at single locations the way particles are absorbed.
Light PP.ppt
1. Light travels in straight lines and can be reflected or refracted. Reflection occurs when light bounces off a surface, while refraction is when light changes speed and direction when passing through different materials.
2. Mirrors come in different shapes that determine whether images are virtual or real, and lenses use refraction to bend light and form images. Concave lenses form virtual images while convex lenses form real images.
3. White light is composed of all visible wavelengths combined, and different materials reflect or absorb particular wavelengths, determining their perceived color. Color mixing with light follows the same principles as mixing with pigments. Filters can be used to selectively transmit or block certain wavelengths of light.
Light
Light is a form of electromagnetic radiation that travels in straight lines. It travels extremely fast at around 300,000 kilometers per second. Light can be reflected, refracted, or absorbed when it interacts with different materials and surfaces. Reflection is when light bounces off a surface, following the law of reflection where the angle of incidence equals the angle of reflection. Refraction is when light changes speed and direction as it passes from one medium to another of different density, such as from air to water. The human eye can see light due to photoreceptors in the retina that detect wavelengths of visible light and allow us to perceive color.
SEC-8B-LIGHT .ppt
The Physics of Light, ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Light and sound daily power point
1. The document discusses key concepts about light and sound including that light travels in straight lines while sound travels as waves through matter.
2. Key terms are defined such as reflection, refraction, transparent and opaque objects.
3. The document also explores how lenses work, specifically that convex lenses magnify objects while concave lenses make objects appear smaller.
light-140209104259-phpapp02.pdf
This document discusses the properties of light through a PowerPoint presentation. It covers topics like light traveling in straight lines at very fast speeds, how we see objects based on light reflection, the formation of shadows, and the electromagnetic spectrum. It also discusses reflection off mirrors, the three types of mirrors, and refraction through lenses. The document finishes by covering the topics of color, how white light is made up of the colors of the rainbow, the primary colors of light, and how objects appear different colors based on which wavelengths of light they reflect or absorb.
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Light presentation
- 18. A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light (and red and blue, as purple is made up of red and blue): Purple light White light
- 21. Some further examples: Red Blue Red Blue Black Red Blue Red Red Black Blue Green Magenta book Green Green camel Green Blue teddy Black Green Red socks Colour object seems to be Colour of light Object Homework
- 23. Investigating filters Yellow Magenta Cyan Blue Green Red Colours that could be “seen” Colour of filter
- 24. Red Magenta White Yellow Blue Green Cyan
- 25. Refraction Refraction is when waves ____ __ or slow down due to travelling in a different _________. A medium is something that waves will travel through. When a pen is placed in water it looks like this: In this case the light rays are slowed down by the water and are _____, causing the pen to look odd. The two mediums in this example are ______ and _______. Words – speed up, water, air, bent
- 28. Sound – The basics We hear things when they vibrate . If something vibrates with a high frequency (vibrates very ______) we say it has a _____ pitch. If something vibrates with a low frequency (vibrates ______) we say it has a ____ pitch. The lowest frequency I could hear was… Words – slowly, low, high, quickly
- 29. Drawing sounds… This sound wave has a _____ frequency : This sound wave has a ___ _frequency :
- 30. Drawing sounds… This sound wave has a _____ amplitude (loud): This sound wave has a _____ amplitude (quiet):
- 33. The Ear Label your diagram with the following: These bones are vibrated by the eardrum This tube carries the sound towards the eardrum This part is used to help us keep our balance This part “picks up” the vibrations This part of the ear contains many small hairs with turn vibrations into an electrical signal This part connects the ear to the mouth This part “channels” the sound towards the ear drum
- 34. The Ear