5.6.170 - Redshift and Hubble’s law

Use redshift z = Δλ/λ ≈ −Δf/f ≈ v/c for a source moving relative to an observer, and Hubble's law v = H0d for cosmological distances.

Use - redshift and hubble’s law to connect the rule to the data and decision in the question.

This matters because - redshift and hubble’s law determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - redshift and hubble’s law to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Redshift and Hubble’s law is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.