13: Equations Flashcards
1
Q
Ratio of Δλ to λ
A
Δλ/λ = v/c, if v «_space;c
Δλ = difference between the observed wavelength and emitted wavelength λ = emitted wavelength v = velocity if the source c = speed of light
2
Q
Velocity = (Hubble’s constant)
A
v = H₀d v = recessional velocity H₀ = Hubble's constant d = distance
3
Q
In the equation v = H₀d, what unit is velocity?
A
kms⁻¹
4
Q
In the equation v = H₀d, what unit is Hubble’s constant?
A
kms⁻¹Mpc⁻¹
5
Q
In the equation v = H₀d, what unit is distance?
A
Mpc, megaparsec
6
Q
What is 1 Mpc in m
A
3.09 * 10²²
7
Q
Relativity t =
A
t = λτ
where t = actual time (longer)
τ = expected time w/o relativity (shorter)
λ = relativistic factor (always greater than 1)
