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Y9SciPhyTopic1
Year 9 Science Physics Topic 1 Visible Light and the Solar System
| Question | Answer |
|---|---|
| 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
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