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Chapter 29: Q14CQ (page 1061)

Tanning salons use 鈥渟afe鈥� UV with a longer wavelength than some of the UV in sunlight. This 鈥渟afe鈥� UV has enough photon energy to trigger the tanning mechanism. Is it likely to be able to cause cell damage and induce cancer with prolonged exposure?

Short Answer

Expert verified

Yes, high exposure for UV can induce cancer even if we use long-wavelength UV rays. It is all depending on the amount of energy the cell receive.

Step by step solution

01

UV rays

Since UV rays have high energy, it has the ability to alter molecules; they can do what visible light cannot.

02

High exposure to UV rays

It can trigger the production of vitamin D in the skin, whereas visible light has insufficient energy per photon to alter the molecules that trigger this production, but also we should consider that UV can cause skin cancer so in order to have the preferable effect on the skin they must use long wavelengths rays to reduce the amount of the energy that will be absorbed by the skin and not to exposure it for a long time to the UV rays.

Therefore, high exposure for UV can induce cancer even if we use long wavelength UV rays. It is all depending on the amount of energy the cell receive.

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