According to Hubble's Law, the recessional velocity v v\,v of a distant galaxy is proportional to its distance d d\,d from Earth. Under the assumption of a constant rate of expansion, which of the following expressions provides an estimate for the age of the Universe?
vd\frac{v}{d}dv
dv\frac{d}{v}vd
1v⋅d\frac{1}{v \cdot d}v⋅d1
v⋅dv \cdot dv⋅d
59 exam-style questions on CIE IGCSE Physics 6.2.3a Galaxies and the scale of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.