Conduction

If two objects have different temperatures, heat will flow from the cooler object to the warmer one.

• True
• False

Conduction is the transfer of thermal energy ___________.

• in the form of electromagnetic waves such as infrared radiation without the aid of a medium
• through a medium without any flow of the medium
• by means of convection currents in a fluid (liquid or gas), due to a difference in density
• None of the above

Heat transfer by conduction occurs when...

• particles bump into each other
• large numbers of atoms move from place to place
• atoms give off heat in the form of electromagnetic waves
• electromagnetic waves travel from place to place through a vacuum

List the correct order of conduction.
1. They collide more vigorously with neighbouring particles
2. Particles at the heated end gain kinetic energy and vibrate vigorously.
3. Particles at cooler end vibrate vigorously.

• 1, 2, 3
• 3, 2, 1
• 2, 1, 3
• 1, 3, 2

Which material is the best conductor of heat?

• Wood
• Plastic
• Glass
• Steel

Why do metals conduct thermal energy more quickly?

• Particles vibrate faster
• Due to the presence of bound electrons
• Due to the presence of free electrons
• Metals are grey

Why are gases poor conductors of electricity?

• Particles are close together and collisions are more frequent
• Particles are far apart and collisions are less frequent
• Particles are close together and collisions are less frequent
• Particles are far apart and collisions are more frequent

Which phase is the best conductor of heat?

• Solid
• Liquid
• Gas

Which of the following is an application of conduction?

• Thermal energy from the Sun to Earth
• Pots having metals bodies and plastic handles
• Vacuum flasks having silver bodies
• Air conditioners cooling down a room