1725235
Descrição
FlashCards por Joel Manning, atualizado more than 1 year ago
|
Criado por Joel Manning
quase 10 anos atrás
|
|
| Questão | Responda |
| What is the Geocentric model? | A design of the solar system by Ptolemy where the earth was at the centre of everything |
| What is the Heliocentric model? | A design of the solar system by Nicolaus Copernicus where the sun was at the centre of the solar system |
| Which model of the solar system was believed to be correct until the 1600s? | The Geocentric model |
| What invention caused new ideas about the solar system? | The Telescope |
| How are we able to study distant objects? | Luminous objects in space give out visible light that travels as waves of energy. These visible light waves allow people to study distant objects. We can see planets in our Solar System because they reflect sunlight. Some objects in space give out other types of energy-carrying waves, like radio waves and microwaves. Different types of telescopes are used to detect these. |
| Who was the first to back up Copernicus' model after the invention of the telescope and why? | Galileo Galilei, discovered Jupiter's four moons and by plotting their movements showed that not everything orbited the earth. |
| What happened to Galileo Galilei with his support of Copernicus' model? | The church was still against the idea, and put Galileo under house arrest for the last 10 years of his life. |
| How can photographs help observe the universe (compared with telescopes or naked eye)? | It allows you to 'zoom in' and look at objects in more detail. It makes it easier to monitor an object by taking pictures at different times to compare them and to share your observations with others. You can also see faint objects by allowing a long exposure time so you can collect more light (which can't be done with the naked eye!) |
| How did Galileo's observations of Jupiter (using the telescope) provide evidence for the heliocentric model of the Solar System? | He observed 4 'stars' near Jupiter and plotted their movements. This made him realise that there were not stars but actually moons orbiting Jupiter. This showed that not everything was in orbit around the Earth (so the geometric model was wrong). |
| Suggest one way in which our current model of the Solar System is different from Copernicus's | We now know that the orbits are actually elliptical rather than circular. Our current model states that the Sun is not at the centre of the Universe. |
| How does a refracting telescope work? | It has 2 converging lenses. A convex lens (the objective lens) creates an image inside the tube and another lens (the eyepiece lens) is used to magnify this image. |
| What is refraction and where does it happen? | The change of speed & direction of a wave when it enters a new material. It happens at the interface (boundary) between the two materials (e.g. air & water). It occurs because light travels at different speeds in different materials. |
| What is the focal length of a lens? | The distance from a convex lens to the point where the image of a very distant object is produced. |
| What is a convex lens and how does it work? | A convex (or converging) lens is a glass block that is curved on both sides to make it thicker in the middle. Light rays entering the lens from air are brought together or converge. Rays of light from distant objects are almost parallel when they reach us. |
| When are waves reflected? | At boundaries between different materials |
Quer criar seus próprios Flashcards gratuitos com GoConqr? Saiba mais.