16 Infrared
What do you call the area marked with '???'?
Darkred area
Infrared area
Ultrared area
For us humans, visible light consists of wavelengths between 400 nanometers and 850 nanometers, the typical rainbow colors. Shorter wavelengths are found in the ultraviolet range and longer wavelengths form the infrared range.
For us humans, visible light consists of wavelengths between 400 nanometers and 850 nanometers, the typical rainbow colors. Shorter wavelengths are found in the ultraviolet range and longer wavelengths form the infrared range.
The screen is connected to a special camera, which camera is it?
Infraredcamera
Ultravioletcamera
It is an infrared camera. This can record light waves, which are in the ten micrometer range, and thus make this area visible to us humans with the help of a screen and "false" colors.
It is an infrared camera. This can record light waves, which are in the ten micrometer range, and thus make this area visible to us humans with the help of a screen and "false" colors.
How do humans perceive infrared radiation?
With the light receptors in our eye
With infrared receptors in the mucous membranes
With the temperature receptors in our skin
In humans, infrared radiation in the ten micrometer range is perceived differently than visible light with specialized temperature sensors in the skin. Various snakes have a special sensory organ for detecting infrared and therefore can detect warm-blooded animals.
In humans, infrared radiation in the ten micrometer range is perceived differently than visible light with specialized temperature sensors in the skin. Various snakes have a special sensory organ for detecting infrared and therefore can detect warm-blooded animals.
What statement can be made based on the color of the cups on the infrared image?
The cup shown with brighter colours reflects more rays of light than the other cup
The cup shown with lighter colours is warmer than the other cup
The cup shown with lighter colours consists of a denser material than the other cup
An infrared camera in the ten micrometer range is nothing more than a thermal imaging camera. The warmer an object is, the more infrared radiation it emits. The colors of the infrared image make a statement about the detected infrared radiation. Normally, they are chosen in such a way that more infrared radiation leads to brighter colors.
An infrared camera in the ten micrometer range is nothing more than a thermal imaging camera. The warmer an object is, the more infrared radiation it emits. The colors of the infrared image make a statement about the detected infrared radiation. Normally, they are chosen in such a way that more infrared radiation leads to brighter colors.
What can you see with the thermal camera shortly after the hand was pressed on the wood for a few seconds?
The infrared image shows a circle.
The infrared image shows an ellipse.
The infrared image shows a handprint.
While the warm hand is placed on the colder wood, the warmth of the hand is transferred to the wood. Due to the good insulation of the wood, the heat is stored for a while and a handprint can be seen on the infrared image.
While the warm hand is placed on the colder wood, the warmth of the hand is transferred to the wood. Due to the good insulation of the wood, the heat is stored for a while and a handprint can be seen on the infrared image.
What does this image look like when you take it with the thermal camera?
The person in the plastic bag becomes visible
The plastic bag will appear completely in white
The person in the plastic bag remains unrecognizable
The plastic bag consists of a material (polyethylene), which absorbs visible light, thus appears opaque to the human eye. However, infrared light is not absorbed. Since every human being emits thermal infrared light, this can be detected by the camera and the plastic bag appears transparent.
The plastic bag consists of a material (polyethylene), which absorbs visible light, thus appears opaque to the human eye. However, infrared light is not absorbed. Since every human being emits thermal infrared light, this can be detected by the camera and the plastic bag appears transparent.
An apple is in an empty aquarium. Can you recognize the apple with a thermal camera?
Yes
No
Glass appears transparent to the human eye as it does not absorb visible light. However, infrared light is absorbed and therefore glass is opaque for a thermal imaging camera. The apple behind the glass can no longer be recognized.
Glass appears transparent to the human eye as it does not absorb visible light. However, infrared light is absorbed and therefore glass is opaque for a thermal imaging camera. The apple behind the glass can no longer be recognized.
What is the behaviour of a metal plate with thermal infrared light?
The metal plate completely absorbs the infrared radiation and a dark rectangle can be seen on the infrared image
The metal plate generates heat and a bright rectangle can be seen on the infrared image
The metal plate serves as a mirror and a mirror image can be seen on the infrared image
Due to its small surface defects, the metal plate does not reflect any visible light. On the other hand, the metal plate behaves like a mirror in the infrared range, where the wavelength is greater than the surface defects.
Due to its small surface defects, the metal plate does not reflect any visible light. On the other hand, the metal plate behaves like a mirror in the infrared range, where the wavelength is greater than the surface defects.
This quiz was written by the Luxembourg Science Center in Differdange. Visit the Centre to learn more about infrared and other scientific topics!
This quiz was written by the Luxembourg Science Center in Differdange. Visit the Centre to learn more about infrared and other scientific topics!
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2 Luxembourg Science Center
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Images copyrights:
1 Luxembourg Science Center
2 Luxembourg Science Center
3 commons.wikimedia.org
4 Luxembourg Science Center
5 Luxembourg Science Center
6 Luxembourg Science Center
7 Luxembourg Science Center
8 Luxembourg Science Center
9 Luxembourg Science Center
10 Luxembourg Science Center
11 Luxembourg Science Center
12 Luxembourg Science Center
13 Luxembourg Science Center
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