Question

Write True or False.
1. Conduction takes place in solids only.
2. Heat cannot be transferred by convection in gases
3. Heat makes the particles of matter move faster
4. In convection, the hot particles move upwards.
5. Good absorbers of heat are poor radiators of heat.​

Answer 1

Answer:

true

false

false

true

true

Answer 2

Answer:

1. False, 2.False, 3. True, 4. True, 5. False

Explanation:

1. Conduction is the transport of heat that occurs in materials without the actual movement of molecules. It takes place in solids only.
2. Convection is the macro form of heat transfer since it involves particle mobility. Convection is only possible in fluids with easily moving particles, and the rate of convective heat transfer is highly dependent on the rate of flow.
3. The particles gather kinetic energy and move faster as the temperature rises. The actual average speed of the particles is determined by their mass and temperature; heavier particles travel more slowly at the same temperature than lighter particles.
4. Differential heating results in convection currents. Warm material that is lighter (less dense) rises, while cooler material that is heavier (more dense) sinks.
5. The good absorbers of heat are good emitters of heat. This is based on Kirchhoff's radiation law.