CIE iGCSE Co-Ordinated Science P2.3.3 Radiation Exam Style Questions Paper 1
▶️ Answer/Explanation
A vacuum prevents both conduction and convection because these methods require particles (atoms, molecules, or fluids) to transfer energy. Since a vacuum contains no particles, there is no medium for conduction or convection to occur. However, radiation does not require a medium and can travel through a vacuum, so it is not prevented. Therefore, the correct option is A.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Thermal radiation is the transfer of energy by electromagnetic waves, which do not require a medium to travel through. Conduction and convection both require a medium (solid, liquid or gas). Evaporation involves liquid particles escaping. Therefore, radiation is the only method that can transfer energy through the vacuum of space from the Sun to the Earth.
✅ Answer: (D)
✅ Answer: (D)
▶️ Answer/Explanation
Radiation (infrared) is the only method of thermal energy transfer that can occur through a vacuum because it does not require a medium. Conduction and convection require particles to transfer energy, and insulation reduces transfer but is not a method itself.
✅ Answer: (D)
✅ Answer: (D)
Question
How is thermal energy transferred from the Sun through the vacuum of space?
(A) by conduction and convection
(B) by convection and radiation
(C) by convection only
(D) by radiation only
▶️Answer/Explanation
Ans : D