Infrared praticle

Question 1

Infrared waves:

Answer 1

• The human eye cannot see these waves.

Question 2

Praticle:

Answer 2

Equipment:

• Leslie’s cube: Can be used to see how much infrared is emmited from different substances.
• 4 different substances: Shiny Metallic, White surface, Shiny Black, Matt black.

Method:

1) Fill the leslies cube with hot water.
2) Point an infrared detector at each 4 of the surfaces and record the amount of infrared emmited

IMPORTANT NOTE: keep same distance between the leslies cube and infrared detector (makes measrurments repeatable).

Question 3

Results:

Answer 3

• Mat Black Surface: Emits most infrared radiation.
• Followed by Shiny black and then the white surface.
• Shiny metallic= emits the least infrared radiation.

Question 4

What happens if you don’t have an infrared detector?

Answer 4

• Use a therometer with the bulb painted black.
• Resolution of the thereometer is lesser than the infrared detector.
• Resolution= smallest change that can be detected.

Problems:
- Not be able to detect a large difference between the surfaces using a thermometer.
- Infrared dector= more likely to detect a difference.
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