Question

in each of the following situations, identify the method of heat transfer taking place. write conduction, convection, or radiation on the line next to the statements. choose the best answer.

1. you are stirring a bowl of hot soup with a metal spoon. the spoon starts to feel warmer because of
2. you buy a lava lamp from the store. as the lamp heats up, blobs of liquid rise to the top then sink back down to the bottom. this process continues because of
3. you are doing your homework at a desk that is underneath a lamp. you start to feel hotter because of
4. your best friend has a bunk bed. you move from the bottom bunk to the top bunk and notice that the air is warmer. the warm air rises because of
5. you are in science class and want to see if the hot plates were used recently. you place your hand over the hot plate. without touching the hot plate, your hand feels warmer. heat is transferred to your hand by
6. you are roasting marshmallows at a campfire. the metal skewer (stick) that youre cooking your marshmallow on burns your hand because of

Explanation:

Step1: Recall heat - transfer methods

Conduction is heat transfer through direct contact, convection is heat transfer through the movement of fluids (liquids or gases), and radiation is heat transfer through electromagnetic waves without the need for a medium.

Step2: Analyze situation 1

Stirring a bowl of hot soup with a metal spoon, the spoon heats up because of conduction as the metal atoms in the spoon vibrate and transfer energy to adjacent atoms when in contact with the hot soup.

Step3: Analyze situation 2

In a lava lamp, blobs of liquid rise and sink due to convection. The heating element at the bottom heats the wax - like liquid, causing it to expand, become less dense and rise. When it cools at the top, it becomes denser and sinks.

Step4: Analyze situation 3

Sitting at a desk under a lamp and feeling hotter is due to radiation. The lamp emits infrared radiation (a form of electromagnetic radiation) that travels through the air and is absorbed by your body, making you feel warmer.

Step5: Analyze situation 4

Warm air rising from the bottom bunk to the top bunk is convection. The air near the bottom is heated (could be from body heat or other sources), becomes less dense and rises, while cooler air sinks.

Step6: Analyze situation 5

Feeling heat from a hot plate without touching it is radiation. The hot plate emits infrared radiation which travels through the air and warms your hand.

Step7: Analyze situation 6

Roasting marshmallows, the heat from the campfire is transferred to the marshmallow and hand through radiation (emitted by the fire) and the metal skewer conducts heat to your hand when it gets hot. But the main reason the marshmallow burns is radiation from the fire.

Answer:

1. Conduction
2. Convection
3. Radiation
4. Convection
5. Radiation
6. Radiation