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Physics yella
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- 1~Geocentric model~In Ptolemy's geocentric model, the planets moved in their own little circles, and earth was in the centre.
- 2~Heliocentric model~Copernicus's model is how the solar system is actually set out, with the sun in the middle, and all the other planets orbit the sun (except the moon, that orbits earth).
- 3~Galileo Galilei~Discovered that Jupiter had 4 moons, by plotting their movements he realised not everything orbited Earth. (these findings could support Copernicus's ideas) Church didn't like this idea so arrested him for 10yrs.
- 4~Astronomy today~Some objects in space give out visible light waves and allow people to study distant objects. Manny objects don't give out light waves but instead give out radio waves and microwaves, we have different types of telescopes to detect these waves.
- 5~Refraction~Light travels in straight lines, however it can change direction when it hits a substance of different density, this is called refraction, and happens at the interface between to materials.
- 6~Refraction in lenses~A lens is a transparent block that s shaped to change the direction of parallel light waves.
- 7~Refraction in lenses~ Converging lensA converging (or convex)lens, is a glass block that has been curved both sides to make it thicker in middle. Light rays enter lens and are brought together of converge. (focuses the rays)
- 8~Refraction in lenses~ Converging lens Picture
- 9~Refracting telescope~In this telescope a convex lens creates an image inside a tube, another lens (eyepiece lens) is used to magnify this image.
- 10~Refracting telescope~ Picture
- 11~Reflection in telescopes~ Part 1Waves are also reflected at boundaries between different materials. this means whenever light passes through a lens, some is reflected, this makes an image much fainter, and can be a problem for refracting telescopes.
- 12~Reflection in telescopes~ Part 2Refracting telescopes also need to be v/ long to have large magnifications. large lenses improve the magnification, but they a hard to make perfectly, and can distort the colours in an image...
- 13~Reflection in telescopes~ Part 3This is not a problem for reflecting telescopes because they have a curved mirror instead of objective lens in them. The curved Primary mirror focuses parallel light rays from a distant object to an image.
- 14~Reflection in telescopes~ Part 4This image is then magnified by the eyepiece lens like in a refracting telescope. The first reflecting telescope that worked well was produced by Newton in the late 60's. Most modern telescopes are reflecting to view v/ faint stars etc.
- 15~Reflection in telescopes~ Picture
- 16~Electromagnetic waves~(such as light, radio waves and microwaves) are transverse and do not need a medium through which to travel.
- 17~Sound waves~Not transverse. in a sound wave particles move back and forth in line of the direction that the wave is going. these are Longitudinal waves.
- 18~Frequency~Wave frequency is the amount of waves passing a point each second. it is measured In Hertz. A frequency of 1Hz is 1 wave passing per second.
- 19~Wavelength~The wavelength is the distance from a point on one wave to the same point the next wave. It is measured in metres.
- 20~Amplitude~The Amplitude is the maximum distance of a point of a wave form its rest position, measured in metres.
- 21~Wave Characteristics Diagram~
- 22~Electromagnetic Spectrum~
- 23~CMB~Cosmic microwave background
- 24~Blue and Red Shift~Blue= away
Red= towards - 25~Life cycle of star~ (top one= sun)
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- Fichas sobre Physics yella, creado por Alicia Tamlyn el 14/06/2015.
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- Alicia Tamlyn
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