Flashcards
Waves and refracting telescopes
Flashcards do conjunto (5)
- 1Geocentric model = Everything orbits the Earth (it is in the centre) in perfect circles Heliocentric model = Everything orbits the Sun (this is in the centre) Cosmology = Everyone observes the same expansion from all points in the universe (no centre of the universe)Galileo's observations:
- refracting telescope
- Jupiter had 4 moons
- They orbited Jupiter
- This showed that not everything orbited the Earth - 2Wave length: The distance from one peak to the next Frequency: How many complete waves per second Amplitude: The height of the wave (from the mid-line to the peak) Speed: How fast it goesWAVES TRANSFER ENERGY AND INFORMATION WITHOUT TRANSFERRING MATTER
- 3Transverse Waves: - Light waves - EM waves - Waves on strings and springs - S-Waves (in TRANSVERSE waves the vibrations are at 90° to the DIRECTION OF TRAVEL of the wave)Longitudinal waves:
- Sound waves
- Ultrasound waves
- A slinky spring when you push and pull the end
- P-Waves
(in LONGITUDINAL waves the vibrations are along the SAME DIRECTION as the wave is travelling) - 4Refraction: - The bending of light towards the normal as it passes through glass - Light changes speed as it passes from one median to anotherRefracting Telescopes:
- Bending light through a lens so that it forms an image
It has an objective lens, a focus and eyepiece. - 5advantages of a refracting telescope: - Cheap - Simple to use - Good at looking at the solar systemDisadvantages of a refracting telescope:
- It leaves the final image upside down
- Not very powerful
- Chromatic aberration (colour distort)
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- FlashCards sobre Sem título, criado por Ellie Pike em 24-03-2014.
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- Ellie Pike
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