P1 topic 1 key words Edexcel core 0.0 / 5 ? SciencePhysicsGCSEEdexcel Created by: RhiiiiCreated on: 04-06-13 19:08 Geocentric model Model of the solar system in which the Earth is at the centre 1 of 23 Heliocentric model Model of the solar system in which the sun is at the centre 2 of 23 Wave speed Distance travelled by a wave / Time it takes the wave to travel that distance 3 of 23 Amplitude The maximum distance of particles in a wave from their original position 4 of 23 Frequency The number of waves which pass a certain point every second 5 of 23 Orbit The path taken by a planet around the sun, or by a satellite around a planet 6 of 23 Wave length Distance between a point on wave and the same point on the next 7 of 23 Longitudinal wave Waves in which particals move back and forth parallel to the wave's travel 8 of 23 Transverse wave Waves in which particles move up and down at right angles to the direction of travel 9 of 23 Seismic wave Waves produced in an explosion or by an earthquake which travel through the earth. they include P and S waves. 10 of 23 Electromagnetic waves Waves which are all transverse and travel at the speed of light in a vacuum 11 of 23 Hertz A unit for measuring frequency 12 of 23 Reflection When a wave bounces off a boundary between two materials 13 of 23 Refraction The change of speed and direction of a wave when it enters a new material 14 of 23 Convex lens A lens which bulges outwards in the middle 15 of 23 Objective lens The lens in a telescope which is nearest to the object being observed 16 of 23 Eyepiece lens Lens in a telescope which magnifies the image produced - closest to the observer 17 of 23 Reflecting telescope Telescope in which the focussing of the image is done by a mirror 18 of 23 Refracting telescope A telescope which consists of a series of lenses 19 of 23 Primary mirror The main mirror in a reflecting telescope which converges light to form an image 20 of 23 Focal length The distance between a convex lens and the point at which the image of a very distant object is produced 21 of 23 Real image An image in which the rays of light meet at a point where the image is seen 22 of 23 Virtual image An image that cannot be projected onto a screen, where the light appears to come from the image itself 23 of 23
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