Question 9
FA student wraps three identical boiling tubes in different materials: black paper, white paper and shiny aluminium foil. Each tube is filled with the same volume of hot water.
The Figure shows how the temperature of the water in each tube changes with time.
Figure
a.[1]
Determine the temperature fall of the water in the tube wrapped in black paper in the first 10 minutes.
b.[3]
Calculate the average rate of cooling of the water in the tube wrapped in aluminium foil over the 20 minutes.
Give the unit.
c.[2]
Explain why the curve for the black paper is steeper at the start than at the end.
d.[2]
Give the order of the three wrappings from the best emitter of infrared radiation to the worst.
Explain how the Figure shows this.
5.3 Black body radiation Questions
96 exam-style questions on Edexcel GCSE Physics 5.3 Black body radiation, covering 5.3.1 Emission of radiation and temperature, 5.3.2 Radiation balance and constant temperature, and 5.3.3 The temperature of the Earth. Each one has a worked solution and a mark scheme showing where the marks go.