Cosmology Flashcards
What are some arguments in favour of the Big Bang Theory?
- Cosmic Background Microwave Radiation (CMBR)
- Greater red-shift for far away galaxies as they are moving faster.
What is CMBR?
Low frequency microwave radiation coming from all directions and all parts of the universe.
This is evidence for the Big Bang because as the universe expands and cools, the background radiation ‘cools’ and drops in frequency.
What is the relation with Red-shift and distance galaxies?
More distant galaxies are moving away faster, and so they have greater red-shifts.
What is the Doppler Effect?
The apparent change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave.
What is red-shift?
The change in wavelength of light (towards the red end of the spectrum) from a star that is moving away from Earth
Unit of mass
Kilogram (Kg)
Unit of length
Metre (m)
Unit of speed/ velocity
Metre/ second (m/s)
Unit of acceleration
Metre/ second^2 (m/s^2)
Unit of force
Newtons (N)
Unit of time
Second (s)
Unit of gravitational force
Newton/ kilogram (N/Kg)
What is the equation relating to change in wavelength, reference wavelength,
velocity of a galaxy and the speed of light?
Change of wavelength/reference wavelength = velocity of galaxy/star / speed of light
λ-λ0/ λ0 = v/c
λ = observed wavelength
λ0 = reference wavelength (wavelength measured in a stationary lab)
What is the speed of light in a vacuum (in metres/ second)
3million metres/ second
