Question 1
Thermal radiation is part of the electromagnetic spectrum.
What is the name of this region of the spectrum?
A
gamma rays
B
infrared
C
ultraviolet
D
visible light
Question 2
Some hot water is sealed inside a metal can. The can is in a vacuum in outer space. The hot water slowly cools down.
How does the thermal energy escape into space?
A
by conduction then convection
B
by conduction then radiation
C
by evaporation then convection
D
by evaporation then radiation
Question 3
A student wants to investigate good and bad absorbers of thermal radiation. She has the apparatus shown in Fig. 5.1, a supply of cold water and a metre rule.
Fig. 5.1
Explain how the student could use the apparatus she has available to carry out her investigation. Describe the results she would expect to obtain. Draw a diagram of the set-up.
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