Heat and Light

Concept Recall:

What is the speed of light in the air?

• 300 m/s

• 30 000 m/s

• 300 000 m/s

• 300 000 000 m/s

Concept Recall:

What color has the shortest wavelength, or the highest frequency?

• red

• blue

• yellow

• violet

Concept Recall:

What color has the longest wavelength, or the lowest frequency?

• red

• blue

• yellow

• violet

Comprehension:

How is a specular reflection different from a diffuse reflection?

• A specular reflection occurs on rough surfaces.

• A specular reflection occurs on uneven surfaces.

• A specular reflection occurs on the surface of still water.

• A specular reflection occurs on the surface of running water.

Concept Recall:

It is the measure of the average kinetic energy present in a system.

• heat

• thermometer

• temperature

• specific heat

Concept Recall:

It is a form of energy resulting from the movement of molecules in an object.

• heat

• thermometer

• temperature

• specific heat

Comprehension:

How do roofs become hot during summer?

• There is direct contact between the roof and the heat source.

• There is an upward movement of the hot air which is absorbed by the roof.

• There is a downward movement of warm liquid which is absorbed by the roof.

• The heat from the sunlight radiates above making the roofs hot.

Comprehension:

How do thermometers work?

• Heat flows from the warm environment to the colder thermometer, causing the fluid to drop.

• Heat flows from the warm environment to the colder thermometer, causing the fluid to rise.

• When the KE in the fluid increases, the temperature reading drops.

• When the KE in the fluid increases, the temperature reading does not change.

Synthesis:

0 degree Celsius; 32 degrees Fahrenheit; 273 K

• absolute zero

• the boiling point of water

• the freezing point of water

• the steaming point of water

Synthesis:

0 Kelvin; -273 degrees Celsius; all molecular motion stops

• absolute zero

• the boiling point of water

• the freezing point of water

• the steaming point of water