science

science

1. physics

   • refracted
     • light waves refract when they hit boundarys between air and glass
     • waves bends or changes direction
     • refracted at the boundary between different materials
   • reflection
     • angle of reflection is the same as the angle of incidence
     • boundary is a place where two things meet
   • waves and the universe
     • waves
       • frequency is how many complete waves there are per second
         • hertz/ 1hz is 1 wave per second
       • amplitude is just the height of the wave
       • wavelength is the distance from one peak to the next
     • visible light
       • faint objects by having a long exposure time
       • planets in our solar system,they reflect sun light
   • solar system
     • heliocentric model
       • earth and planets all orbit the sun
       • it says the sun is at the centre of the unverse
     • geocentric modal
       • is when the sun, moon ,planets and all orbited the earth in cycles