A student examines whether black surfaces or silver surfaces are more effective at emitting infra-red radiation. The student is supplied with two identical test tubes, one having a silver surface and the other a black surface, together with hot water.
(a)[1]
State one additional item of apparatus needed to perform this investigation.
(b)[3]
Describe how she carries out the investigation. A diagram may be included to support your description. State the readings she takes.
(c)[2]
State two quantities that the student holds constant in the experiment you described in (b).
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A thermometer or a pyrometer” …