EASY
Upper Secondary-IGCSE
IMPORTANT
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When air is heated, the speed of molecules .(increases/ decreases/ stays same)

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Important Questions on Thermal Energy Transfers

EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.2>Q 4
Explain in detail why the smoke produced by a candle flame rises upwards.
MEDIUM
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 1
State what thermal or infrared radiation is.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 2
Two identical cups containing equal volumes of water sit on a table. One starts at a temperature of 50 °C and the other at 40 °C. State which will cool fastest. Explain your answer.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 3
Explain why energy can reach us from the Sun by radiation but not by conduction or convection.
MEDIUM
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 4
Infrared radiation may be absorbed when it reaches the surface of an object. Describe the surface of an object that is a good absorber of infrared radiation.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 5
What effect does infrared radiation have on an object that absorbs it?
MEDIUM
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 6
Explain why a cold object warms up and a warm object cools in the same room at the same time, in terms of exchange of infrared radiation.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 11 - Thermal Energy Transfers>Exercise 11.3>Q 7
An ice cube taken from the freezer will rise in temperature, but when it reaches room temperature, it will remain at this temperature. Explain why this happens.