Flashcards
Space, AQA Chapter 16
Flashcards do conjunto (21)
- 1How the Solar System formedThe Solar System formed from gas and dust clouds that gradually became more and more concentrated because of gravitational attraction
- 2What is meant by a protostarA protostar is a concentration of gas and dust that because hot enough to cause nuclear fusion
- 3How energy is released inside the SunEnergy is released inside a star because of hydrogen nuclei fusing together to form helium nuclei
- 4Why the Sun is stableThe Sun is stable because gravitational forces acting inwards balance the forces of nuclear fusion energy in the core acting inwards
- 5Why stars eventually become unstableStars become unstable when they have no more hydrogen nuclei that they can fuse together
- 6The stages in the life of a star with about the same mass as the SunStars with about the same mass as the Sun: protostar → main-sequence star → red giant → white dwarf → black dwarf
- 7The stages in the life of a star which is much more massive than the SunStars much more massive than the Sun protostar → main-sequence star → red supergiant → supernova → neutron star (or black hole if enough mass)
- 8What will eventually happen to the SunThe Sun will eventually become a black dwarf
- 9What a supernova isA supernova is the explosion of a red supergiant after it collapses
- 10What forces keeps planets and satellites moving along their orbitsThe force of gravity between:
•a planet and the Sun keeps the planet moving along its orbit
•a satellite and the Earth keeps the satellite moving along its orbit - 11The direction of the force on an orbiting body in a circular orbitThe force of gravity on an orbiting body in a circular orbit is towards the centre of the circle
- 12How the velocity of a body in a circular orbit changes as the body moves around the orbitAs a body in a circular orbit moves around the orbit:
•the magnitude of its velocity (its speed) does not change
•the direction of its velocity continually changes and is always at right angles to the direction of the force, so
•it experiences an acceleration towards the centre of the circle - 13Why an orbiting body needs to move at a particular speed for it to stay in a circular pointTo stay in orbit at a particular distance, a small body must move at a particular speed around a larger body
- 14What is meant by the red-shift of a light sourceThe red-shift of a distant galaxy is the shift to longer wavelengths (and lower frequencies) of the light from the galaxy because it is moving away from you
- 15How red-shift depends on speedThe faster a distant galaxy is moving away from you, the greater its red-shift is
- 16How people know that the distant galaxies are moving away from EarthAll the distant galaxies show a red-shift. The further away a distant galaxy is from you, the greater its red-shift is
- 17Why people think the universe is expandingThe distant galaxies are all moving away from you because the universe is expanding
- 18What the Big Bang theory of the universe isThe universe started with the Big Bang, which was a massive explosion from a very small point
- 19Why the universe is expandingThe universe has been expanding ever since the Big Bang
- 20What cosmic microwave background radiation isCosmic microwave background radiation (CMBR) is electromagnetic radiation that was created just after the Big Bang
- 21What evidence there is that the universe was created in a Big BangThe red shifts of the distant galaxies provide evidence that the universe is expanding. CMBR can be explained only by the Big Bang theory
Informações
- Descrição
- Year 9 Physics FlashCards sobre Space, AQA Chapter 16, criado por Miles McIntosh em 05-01-2018.
- Criado por
- Miles McIntosh · jan 2018
- Atualizado
- 5 jan 2018
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