Energy transfers by heating

Question 1

What is the thermal conductivity of a material?

Answer 1

The thermal conductivity of a material tells you how quickly energy is transmitted through it by thermal conduction.

Question 2

What are the factors affecting heat loss from a building?

Answer 2

1. The thickness of its walls and roof.
2. The thermal conductivity of the walls and roof.

Question 3

What is a thermal insulator?

Answer 3

A Thermal insulator is material which has a low thermal conductivity the rate of energy transfer through a insulator is low.

Question 4

What does the temperature change of an object depend on?

Answer 4

• The substance’s mass.
• The type of material.
• How much energy is transferred to it.

Question 5

What is the specific heat capacity?

Answer 5

The ammount of energy needed to ratie the temperature of 1Kg of the substance by 1°C.

Question 6

How do you find the Change in thermal energy?

Answer 6

Change in thermal energy (J) = Mass (Kg) x Specific heat capacity (J/Kg°C) x Temperature change (°C).

Question 7

What is a black body?

Answer 7

A black body is a theoretical obhect that obsorbs 100% of the radiation that falls on it.

Question 8

What spectrum is Infrared radiation part of?

Answer 8

Electromagnetic spectrum

Question 9

Infrared radiation

The Higher the temperature of an object …

Answer 9

The more infrared radiation it emits.

Question 10

Absorbed

For an object at constant temperature : Infrared radiation emitted = …

Answer 10

Infrared radiation absorbed

Question 11

continuous range of?

For an object at constant temperature : Infrared radiation is emitted …

Answer 11

across a continuous range of wavelengths.