Fichas
The Big Bang Theory
Fichas del conjunto (8)
- 1The doppler effect The changing of wavelength and frequency of waves relative to the observerWhen the source moves away from the observer, the observed wavelength increases and the frequency decreases
- 2The source moves towards the observer, the observed wavelength decreases and and the frequency increasesSirens are an example
- 3galaxies are a large collection of starsRed-shift- Increase in wavelength of electromagnetic waves emitted by a star ot galaxy due to its motion away from us
- 4the faster the speed of the star, the greater the red-shift isGalaxies further away from us are moving faster than ones which are closer
- 5Bluue-shift- when a galaxy is moving towards us and the rays from the galaxy are moving towards the darker end of the spectrum
- 6All the distant galaxies are moving away from each other, so the whole universe is expanding...
- 7The Big Bang TheoryIf it is now expanding, it suggests there was a massive explosion which started at a very small, initial point where the universe was created
- 8The 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