A student says, "Only objects that are hot enough to glow emit radiation." Which piece of evidence shows that the student is wrong?
A steel bar glows bright red when it is heated inside a furnace.
A shiny surface reflects most of the visible light that falls on it.
A matt black surface absorbs most of the visible light that falls on it.
A thermal imaging camera can see a person in a completely dark room.
40 exam-style questions on AQA GCSE Physics 6.3 Black body radiation, covering 6.3.1 Emission and absorption of infrared radiation and 6.3.2 Perfect black bodies and radiation. Each one has a worked solution and a mark scheme showing where the marks go.