Question 21
FThree identical objects, X, Y and Z, are heated to different temperatures.
The Figure shows how the intensity of the radiation emitted by each object varies with wavelength. The range of wavelengths of visible light is shaded.
Figure
a.[1]
Give the region of the electromagnetic spectrum in which all three curves have their peak.
b.[3]
Identify which object is at the highest temperature.
Give two reasons for your answer, using the Figure.
c.[2]
Explain how the Figure shows that object Z would look brighter and whiter than object Y.
d.[2]
A student says:
'Object X does not emit any visible light.'
Use the Figure to explain whether the student is correct.
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.