Expanding Universe Flashcards
When a source is moving towards you at a constant speed what happens to the observed frequency?
The observed frequency will be greater than the frequency of the sound when the source is at rest
When a source is moving away from you at a constant speed what happens to the observed frequency?
The observed frequency will be less than the frequency of the sound when the source is at rest
What is redshift?
Redshift is when galaxies that are moving away from us emit light which has a wavelength shifted towards red
What is the definition of redshift?
The ratio of the recessional velocity of a galaxy to the speed of light
What is the equation used to estimate the age of the universe using Hubbles law?
t = 1 / Ho
How does the temperature of a star relate to the wavelength of the waves it emits?
The greater the temperature, the lower the value of the peak wavelength
What does redshift show?
The universe is expanding
What does dark matter account for?
Dark matter accounts for the faster than expected rate of rotation of galaxies
What does dark energy account for?
Dark energy accounts for the increasing rate of expansion of the universe
What is cosmic background radiation evidence of?
The Big Bang
