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Year 9 Science Physics Topic 1 Visible Light and the Solar System

Orbit the path taken by a planet around the Sun, or a satellite around a planet
Geocentric Earth centered
Heliocentric Sun centered
Telescope a device used for producing magnified images of distant objects
Naked eye Observations made using just the eyes, without using a telescope or any other aid
Visible light electromagnetic waves that can be detected by the human eye
Light waves electromagnetic waves that can be detected by the human eye
Radio waves a part of the electromagnetic spectrum
Microwaves a type of electromagnet wave
Solar System The Sun, all the planets and things that orbit it
Refraction The change of speed and direction of a wave when it enters a new material.
Interface Junction between two different materials
Lens Shaped piece of glass or other transparent material that refracts light in particular ways.
Convex lens A lens that is thicker in the middle than it is at the edges.
Converge To come together
Focal length The distance from a convex lens to the point where the image of a very distant object is produced.
Image Picture formed by a mirror or lens.
Refracting telescope A telescope consisting of a series of lenses.
Objective lens The lens in a telescope nearest to the object being observed.
Eyepiece lens The lens on a telescope closest to the observer’s eyes.
Magnify Enlarge or make things look bigger.
Real image An image in which rays of light actually meet at the point where the image is seen on a screen
Virtual image An image that is not right, it can’t be put on a screen and can be seen as different to the thing for example bigger, the right way up etc.
Reflect When a wave bounces off a boundary between two materials.
Magnification The number of times larger an image is then the object that produced it.
Reflecting telescope A telescope in which the focusing of the main image is done by a curved mirror.
Primary mirror The main mirror in a reflecting telescope which converges light to form an image.
Transfer To move something
Transverse waves Waves in which movements are at right angles to the direction of movement of energy.
Electromagnetic waves A group of waves that all travel at the same speed in a vacuum and are all transverse.
Sound waves Transverse seismic waves that travel through Earth.
Longitudinal waves Waves in which particles move back and forth in parallel with the direction of movement of energy.
Seismic waves Waves produced by an explosion or earthquake and which travel through the Earth. They include P waves and S waves.
Frequency A number of waves passing a point each second.
Hertz (Hz) The unit for frequency,1 Hertz is one wave per second.
Wavelength The distance between a point on one wave and the same point on another wave.
Amplitude The maximum distance for particles in a wave from their normal positions.
Wave speed The distance that a wave travels in one second
Created by: bookcase