Thermal Energy

Question 1

Types of thermal energy transfer

Answer 1

conduction, convection, radiation

Question 2

conduction

Answer 2

the transfer of thermal energy directly through contact of substance and without movement of the substance. e.g a pot on a stove which is hot because of the fire transfers heat to the food in the pot.
metals are good conductors because they have free electrons that can transfer energy

Question 3

convection

Answer 3

transfer of heat through fluids by the upwards movement of warm, less dense regions of the fluid. e.g a heating element draws cold air from the bottom, heats it up and pushed out through the top

Question 4

radiation

Answer 4

transfer of heat energy through IR waves. e.g the sun and heaters using IR

Question 5

convection on shore off shore breeze

Answer 5

during the day the land is heated up quicker because it has a lower specific heat capacity which causes the ground to radiate the heat upwards, cold air from the sea breezes into the land to “fill in the gap” which then gets heated and rises and the cycle continues
at night the opposite happens where the cold air from the land goes seawards as the sea takes longer to lose its heat and the land has lost its heat quickly

Question 6

dark v light on thermal energy retaining

Answer 6

dark absorbs and emits heat faster so it gets warm faster and reaches higher temperatures. it also gets cold faster as well because it emits heat well
light doesn’t absorb heat as well but retain heat better so warms to a lower temperature but cools slower