698068
Descrição
FlashCards por oliviabaines, atualizado more than 1 year ago
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Criado por oliviabaines
mais de 10 anos atrás
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| Questão | Responda |
| The doppler effect The changing of wavelength and frequency of waves relative to the observer | When the source moves away from the observer, the observed wavelength increases and the frequency decreases |
| The source moves towards the observer, the observed wavelength decreases and and the frequency increases | Sirens are an example |
| galaxies are a large collection of stars | Red-shift- Increase in wavelength of electromagnetic waves emitted by a star ot galaxy due to its motion away from us |
| the faster the speed of the star, the greater the red-shift is | Galaxies further away from us are moving faster than ones which are closer |
| Bluue-shift- when a galaxy is moving towards us and the rays from the galaxy are moving towards the darker end of the spectrum |
Image:
redshift (image/jpg)
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| All the distant galaxies are moving away from each other, so the whole universe is expanding | ... |
| The Big Bang Theory | If it is now expanding, it suggests there was a massive explosion which started at a very small, initial point where the universe was created |
| The universe has been expanding ever since the big bang, high energy gamma rad. would have been produced -As the universe expanded it would have become lower-energy rad. | Cosmic microwave background radiation (CMBR) is electromagnetic radiation, created just after the Big Bang; can only be explained by the BB |
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