Booklet 1B - Cosmology (Equations) Flashcards

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1
Q

(Define symbols and units)

A

F - Gravitational Force (N)

G - Universal Constant of Gravitation (see data sheet - m3kg-1s-2)

m - mass (kg)

r - distance between centres of objects (m)

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2
Q

(Define symbols and units)

A

t’ - dilated time (s) observed in a different frame of reference

t - proper time (s) observed in the same frame of reference

v - relative velocity (ms-1)

c - speed of light (ms-1)

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3
Q

(Define symbols and units)

A

l’ - contracted length (m) observed in a different frame of reference

l - proper length (m) observed in the same frame of reference

v - relative velocity (ms-1)

c - speed of light (ms-1)

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4
Q

(Define symbols and units)

A

fo - observed frequency (Hz)

fs - frequency of source (Hz)

v - speed of wave (ms-1)

vs - relative speed of source (ms-1)

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5
Q

(Define symbols and units)

A

z - Redshift (no unit)

λobserved - observed wavelength (m)

λrest - stationary wavelength (m)

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6
Q

(Define symbols and units)

A

z - Redshift (no unit)

v - relative speed of source (ms-1)

c - speed of light (ms-1)

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7
Q

(Define symbols and units)

A

v - speed of recession of galaxy (ms-1)

Ho - Hubble Constant (see data sheet - s-1)

d - distance to galaxy (m)

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