Close
    Search Search

    What are ultraviolet rays?

    What are ultraviolet rays?

    What are ultraviolet rays?



    In physics, ultraviolet radiation is an interval of electromagnetic radiation, belonging to the electromagnetic spectrum, with a wavelength immediately shorter than the light visible to the human eye and immediately higher than that of X rays.



    What are UV rays used for?

    Essential to the synthesis of vitamin D which fixes calcium in the bones and plays a fundamental role in the structure of the epidermis. They help us in tanning. They are responsible for sunstroke and can cause mutations in the structure of cells.

    Who produces the ultraviolet rays?

    Ultraviolet radiation constitutes about 10% of the light emitted by the Sun and is also produced by ionized gases and particular lamps (mercury vapor lamps and Wood's lamps). At high wavelengths it can cause chemical reactions, such as glows or fluorescence phenomena.

    What damage ultraviolet rays?

    - Negative effects: as a result of excessive exposure of the skin to the sun, they can induce the onset of tumors; they break collagen bridges and damage capillaries, triggering premature aging. UVA rays represent 95% of the UV radiation that reaches Earth.


    Why are they called ultraviolet rays?

    Ultraviolet rays are electromagnetic radiation emitted by the Sun, whose wavelengths are immediately lower than those of visible light. They are called this, in fact, because they are “beyond violet”, the last color perceived by the human eye in the spectrum of visible light.


    UV light and its effects



    Find 17 related questions

    What are the most dangerous UV rays?

    UV-C rays are the most dangerous ultraviolet rays and have a wavelength of 100 - 280 nm. UV-C rays are particularly harmful to health as they have a high carcinogenic power. Fortunately, they are retained by the ozone layer and therefore have no particular effect on the skin.


    What are the sun's rays called?

    Ultraviolet rays are electromagnetic radiation of a wavelength between 100-400 nm (nanometers = billionth of a meter) and are the most energetic non-ionizing radiation.


    Why are ultraviolet rays bad for you?

    The ultraviolet (UV) rays emitted by tanning lamps (and the sun) can cause degeneration of skin cells, which can result in premature aging of the skin, with the appearance of wrinkles and spots and sometimes even tumors such as melanoma.

    What does solar radiation cause?

    The first group includes erythema (skin redness due to vasodilation), edema (swelling due to the leakage of fluid from the capillaries), blisters and scaliness (solar radiation stimulates the proliferation of keratinocytes, with a consequent increase in desquamation cutaneous).

    What ultraviolet rays are responsible for temporary pigmentation?

    UVB rays, on the other hand, act at a more superficial level by activating melanogenesis, that is, the production of melanin, responsible for our tanning. Not only that: they are also responsible for sunburn, and other more serious skin conditions.

    How do the sun's rays reach the earth?

    Solar radiation is the radiant energy emitted by the Sun in interplanetary space, generated starting from the thermonuclear fusion reactions that occur in the solar core and which produce electromagnetic radiation at various frequencies or wavelengths, which then propagate in space at speed ...

    Which sun rays are bad for you?

    UVA and UVB rays are harmful to the skin and eyes. Here are some rules to minimize the risks of UV rays.

    What absorbs ultraviolet radiation?

    The UV-C rays emitted by the sun do not reach the earth's surface, while 90 percent of UV-B rays are absorbed by the ozone layer and the rest of the atmosphere.

    What measures must we take to defend ourselves against UV?

    The eyes must be protected with sunglasses. It is important that sunglasses provide good protection from ultraviolet radiation, this is guaranteed by the wording on the package "Block 99% of ultraviolet rays".

    What effects do ultraviolet rays have on the melanin produced by the skin's melanocytes?

    Premature Aging and Wrinkles: Ultraviolet radiation can cause permanent damage to cells, causing deeper wrinkles and blemishes to form and loss of elasticity due to free radical activity and less collagen.

    What disease is the UV lamp used for?

    Positive effects of UV

    These radiations play an important role in the organic synthesis of vitamin D, a substance involved in the development of the skeleton and capable of protecting the bones from diseases such as rickets, osteomalacia and osteoporosis.

    How to protect yourself from UVC rays?

    Damage from UV relates to the formation of skin tumors (especially UVB) and skin aging (especially UVA).
    ...
    1. Wear ultraviolet protective fabrics. ...
    2. Avoid, if possible, the central hours of the day.
    3. Use good quality sunscreens, preferably purchased at a pharmacy.

    What is ionizing radiation?

    X-rays, gamma rays, alpha particles and beta particles are part of ionizing radiation. Even a limited portion of ultraviolet rays (those closest in wavelength to X-rays, coming from the Sun or other sources) have ionizing properties.

    What protects us from harmful sun rays?

    To protect yourself from the sun, there are not only protective creams. ... sunglasses, with lenses that protect against at least 99 percent of UV-A and UV-B rays, a concept that can also be expressed in the label as the absorption of solar radiation up to 400 nm wavelength .

    add a comment of What are ultraviolet rays?
    Comment sent successfully! We will review it in the next few hours.