1. The heat from the sun is transferred through radiation.
The sun emits electromagnetic waves in the infrared region. Because the
transfer was through waves, look at your choices, the answer would be A. Radiation.
2. The transfer of heat through this method is done through conduction. You know that it is
conduction because there was contact between objects. In this case, it is
between the body part and the stove that it touched. The answer is then C. Conduction.
3. Like the sun, the heat is transferred trough
electromagnetic waves from the fire through space. Again heat is transferred
through waves. Because the fire is hotter than the space around it, the heat
will travel to the colder space, where your hands are. The answer would then be
A. Radiation.
4. The heat transfer is between three objects; the spoon;
the pot; and the stove. Now all three of them are in contact. The stove heats
up the pot, so the pot gets hot. The pot then transfers some of that heat to
the spoon, which is also in contact with the pot. So the answer is C. Conduction.
5.Macaroni rise and fall in a pot on the stove because of
the liquid that is surrounding it. The liquid is heated in the pot and when it
warms up it expands and rises, carrying the macaroni with it. When it reaches
the surface it cools down and goes back down, only to be heated again and rise.
This is then considered as B.
Convection.
6. You can picture the lamp above the snake as the sun.
Because they are not touching each other, there is space in between the two.
The lamp radiates heat towards the snake through waves that are travelling
through the space in between them. The answer would then be letter A. Radiation.
7. The transfer of heat by the movement of the warmed matter
would be convection. When gas or liquid warms up, it expands and rise and when
it cools, it goes down causing a circular movement. If you put something in
liquid that is boiling, you will see this action. The answer is B. Convection.
8. Heating vents are usually placed on the floor of a home
because warm air tend to rise. Because of convection, warm air goes upwards and
when it reaches colder surfaces or areas, they fall back down to the heating vents
which will heat them up again. The answer is B. Convection.
9. Insulation prevents heat transfer through conduction. This
is done by putting a space in between objects to prevent direct contact or at
least impede the transfer of energy. For example, when you wear oven mitts
while getting a hot pot or baking pan from the oven. The mitts are poor conductors
of heat, so it impedes the transfer of energy from one object to the other. The
answer is B. Convection.
10.Green house trap heat that is radiated by the ground or
the objects below it. As the ground heats up, it reflects the energy back up,
but greenhouses keep the warm air that the ground has heat up. This warm air
then gets trapped inside the greenhouse, which is why it is warm inside them. The
answer is A. Radiation.
11.The heat that is emitted from the wood stove is used as a
source of heat for the dog. The wood stove is radiating heat through waves. The
dog is keeping itself warm by staying within the path of the waves. It’s like
how campers huddle around a campfire at night to keep warm. The answer is A. Radiation.
12.The kettle on the stove gets hot because the kettle is in
contact with the stove which emanates heat. The heat from the stove is transferred
to the kettle. The fire from a stove is hotter than the kettle, so the heat
travels to the colder object, which is the kettle. The answer is C. Conduction.
13. You use a pot holder when you get the cookie sheet out
of the oven because you do not want to get burned. Pot holders are not good
conductors of heat, or in other words, heat does not travel well through them.
By putting them on, you are preventing the heat from the cookie sheet from
travelling to your hands. The answer is C.
Conduction.
14. The heat that you feel when you sit next to a campfire
travels through radiation. The energy travels in waves through the space in
between you and the fire. Because the air around it is colder than the fire itself,
the heat goes towards the colder area. The answer is A. Radiation.
15. The heat that you feel from your electric blanket is
transferred to you via conduction. Let
us presume that your electric blanket is already warmed up. Now you receive its
heat when you are in contact with the warm electric blanket. This answer is C. Conduction.