2023-07-22 17:30:00
Possibly, you already had the experience of watching a film police in which detectives examined crime scenes with a peculiar flashlight or, on the other hand, perhaps attended a party decorated with lights that made certain objects fill with a remarkable glow. Both experiences illustrate the phenomenon of black light.
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Black light, or ultraviolet light, has a shorter wavelength compared to visible light, making it invisible to human eyes. However, it is possible to see its effects when it affects different materials and surfaces.
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Why do objects glow under black light?
With a wavelength that varies between 315 nm and 400 nm, ultraviolet light emits photons that can be absorbed by the electrons present in atoms. Normally, electrons are in a steady-state energy state, but when given an additional dose of energy, such as that provided by black light, they become excited. Thus, electrons absorb light, transforming it into energy that is then released. However, the released light has a longer wavelength than the absorbed light, entering the range of the spectrum that our eyes can see.
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Which creatures can glow in black light?
There are a myriad of materials and creatures that are capable of glowing in the presence of black light. For example, flying squirrels, when exposed to this light, acquire a pink hydrocolor. Even the friendly platypus has this peculiar trait, with fur that turns a blue-green hue under ultraviolet light.
What is the connection of the black light with the criminal investigation?
You must be wondering about the usefulness of the black light beyond entertainment. In fact, this light has an important function in the investigation of crimes. In the field, researchers use a spray of luminol, a chemiluminescent substance that, when in contact with blood, emits visible light under UV light. This light helps detectives see bloodstains, often invisible to the naked eye.
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Can black light be harmful to health?
Yes, ultraviolet light can pose health risks. Exposure to UVA and UVB, both types of ultraviolet rays, can cause cancer, as both can damage the skin’s DNA. But there’s good news: because they focus on the surface of the skin, it’s easier to identify this type of cancer. When detected early, it is usually easy to treat and cure.
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