13: Equations Flashcards Preview

A Level Physics OCR B > 13: Equations > Flashcards

Flashcards in 13: Equations Deck (7)
Loading flashcards...
1
Q

Ratio of Δλ to λ

A

Δλ/λ = v/c, if v &laquo_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)