Thermal Energy Transfer

Front

Which best describes heat transfer by radiation?

Back

Cooking a hotdog in a microwave.

Answer explanation

Microwaves emit microwave radiation. Microwave radiation is part of the electromagnetic spectrum. Therefore when a Microwave cooks a hotdog it is using radiation to transfer energy to the molecules of the hotdog.

Front

What enables fireman to enter buildings that are on fire and return from them safely?

Back

Fireman wear heat resistant suits.

Answer explanation

The gear that a fireman wears must protect them from intense heat of fires. Insulators resist the flow of thermal energy from one place to another. Therefore a fireman must have gear that protects or insulates there body from the intense heat of the fire.

Front

Which of the following best describes CONVECTION?

Back

The movement of gas or liquid in which warmer parts move up and the colder parts move down.

Front

What kind of heat transfer is occurring when the sun warms the sand?

Back

Radiation

Answer explanation

The sun warms the sand via radiation. The sand absorbs this energy and becomes hot.

Front

Warm air rises and the cool air sinks demonstrates this type of heat transfer.

Back

Convection

Front

Heat transfers from an area of ________ temperature to an area of _______ temperature.

Back

high to low

Answer explanation

Thermal energy is transferred between substances of different temperatures. This energy moves from areas of high concentration (higher temperatures) to areas of low energy (lower temperatures) until they reach thermal equilibrium.

Front

Walking on a warm sand with your bare feet shows this type of heat transfer.

Back

conduction

Answer explanation

Conduction occurs when two objects or substances touch. When objects touch thermal energy transfer via conduction occurs.

Front

Ironing a shirt is an example of:

condensation

,

evaporation

,

conduction

,

convection

Back

conduction

Answer explanation

Conduction occurs when objects touch. Therefore when the iron touches the shirt conduction occurs. The iron is transferring thermal energy by TOUCHING the shirt.

Front

How is heat transferred when gathered around a campfire?

Back

radiation

Answer explanation

What we see as fire is light. Light is electromagnetic radiation. The energy from the fire is transferred to our bodies via radiation or light energy.

Front

This is the transfer of thermal energy through "space".

Back

radiation

Answer explanation

The sun emits light or electromagnetic radiation that transfers energy from the sun to Earth.