Required Practical: Infrared Radiation

Question 1

What emits infrared radiation?

Answer 1

Everything
But mostly by hot objects

Question 2

Leslie’s cube

Answer 2

4 different surfaces:
Shiny metallic
White
Shiny black
Matte black

Question 3

Step 1 of finding infrared emission

Answer 3

Fill Leslie’s cube with hot water

Question 4

Step 2 of finding infrared emission

Answer 4

Point infrared detector at each of the 4 surfaces
Record amount of infrared radiation emitted
Keeping distance the same

Question 5

Results of infrared emission experiment

Answer 5

Most infrared emission:
Nate black
Shiny black
White
Shiny metallic
Least inferred:

Question 6

Step 1 of infrared absorption experiment

Answer 6

Put infrared heater between 2 metal plates
1 metal plate = shiny metallic
1 metal plate = Matte black surface
Drawing pins in between

Question 7

Step 2 to find infrared absorption experiment

Answer 7

Switch on the infrared heater
So metal plates heat up due to absorbing infrared radiation
Time how long it takes for Vaseline to melt/fall off

Question 8

Results of experiment to find infrared radiation absorption

Answer 8

Matte black side pin fell off first = absorbed more infrared = heated up quicker
Shiny metallic surface fell off next

Question 9

Conclusions of both of these experiments

Answer 9

Matte black absorbs and emitted infrared fastest and most
Whereas shiny surfaces tend to reflect them