Physics 1 edexcel topic 1 gcse
gcse revision mind map on visible light solar system waves and reflection
- Created by: Chloe
- Created on: 06-03-13 10:55
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- Topic 1
- Solar System
- Ancient Greeks- Geocentric Model: all orbits Earth
- Copernicus 1543 introduced Heliocentric Model: all orbits Sun
- 1610, Galileo observed Jupiters moons and saw they orbitted Jupiter so proved not everything orbitted Earth and that the Geocantric Model was wrong.
- Current model shows that the planets in our solar system orbit the sun but the orbits are elliptical and nnot circular.
- As technology improves so does our understandingof the Universe eg the invention of the telescope led to the discovery of Uranus
- Visible Light
- Luminous objects in space give out visible light which travels as waves of energy.
- Most of the stuff that astronomers and scientists have learnt has been by using the naked eye.
- Most objects in space are so far away that using the naked eye is only good for mapping their positions.
- Telescopes magnify images so distant objects can be seen in more detail.
- Telescopes have problems eg light pollution, space telescopes overcome those issues but they are expensive.
- Waves
- Wavelength is the distance from one peak to the next.
- frequency is how many complete waves there are per second: 1 Hz is 1 wave per second.
- Amplitude is the height of the wave.
- Speed is how fast it goes
- waves transfer energy and information- they don't actually transfer matter
- Speed = frequency x wavelength
- m/s = Hz x m
- wave speed = distance time
- Transverse- vibrate at a 90 degree angle to the direction of travel
- light and all EM waves
- S- waves (earthquakes)
- waves on strings and springs
- ripples on water
- Longitudal- vibrate along the same direction as the wave is travelling.
- sound and ultrasound
- P- waves (earthquakes)
- slinky spring when you push and pull the end
- oscilloscopes always show things as transverse waves even sound.
- Reflection and Refraction
- reflection
- when a wave hits a boundary between one medium and another some of its energy is reflected.
- why you can see your reflection in a puddle
- the light is reflected due to a change in density. a different density causes light to be reflected at the boundary.
- this is what happens in ultrascanning
- when a wave hits a boundary between one medium and another some of its energy is reflected.
- reflection
- Solar System
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