Understanding Heat Transfer

What are the three methods of heat transfer?

• Conduction, Insulation, Radiation

• Convection, Radiation, Refraction

• Conduction, Compression, Reflection

• Conduction, Convection, Radiation

Why does conduction primarily occur in solids?

• Because particles are closely packed, allowing for efficient energy transfer

• Because particles are more mobile

• Because solids are generally cooler

• Because solids do not allow particle movement

What property determines how well an object conducts heat?

• Density

• Specific heat capacity

• Electrical conductivity

• Thermal conductivity

Why are metals good conductors of heat?

• They are dense

• They are liquids at room temperature

• They have high thermal conductivity

• They have low thermal conductivity

Why are plastics used as insulators?

• Because they are lightweight

• Because they have low thermal conductivity

• Because they are cheap and abundant

• Because they have high thermal conductivity

What causes convection currents in fluids?

• Vibration of particles

• Movement of waves

• Differences in density leading to particle movement

• Electrical charges in particles

How does convection differ from conduction?

• Convection can only occur in solids

• Convection involves the movement of particles themselves

• Convection requires a medium to transfer heat

• Convection involves energy transfer without particle movement

What is a practical application of convection observed in everyday life?

• Heating a room with a radiator

• Insulating a house with foam

• Using a blanket to stay warm

• Cooking on a stove

What is the role of infrared radiation in heat transfer?

• It requires a medium to transfer heat

• It is less efficient than conduction and convection

• It can transfer heat through a vacuum

• It is the only form of radiation that transfers heat

Why do objects emit more radiation when they are hotter?

• Because they are closer to a heat source

• Because they have more kinetic energy

• Because they are usually larger in size

• Because they absorb more radiation