Answer :

The answer to this question would be: 300nm

There are 3 kinds of UV light : UVA, UVB, and UVC. Those light have a different length varies from UVC with the shortest and UVA the longest. To penetrate deeper part of the skin, you will need a longer length. That is why UVA is having the highest capability to penetrate the dermis and become the most damaging UV light.

Minimum UV-wavelength level needed for penetration into the dermis is 300nm.

Further Explanation:

Skin comprises of three-layers, outermost layer is epidermis, middle layer is dermis and inner layer is the subcutaneous tissue. Epidermis comprises five-layer, stratum basale is an inner layer, and they are made up of stem cell, and differentiate into keratinocytes cell. Stratum spinosum, granulosm, and lucidium made up of keratinocytes cell and make thick skin. Stratum corneum is the outer layer of the epidermis. Dermis is comprised of two-layer, papillary layer, which is thin and provides defense against pathogens and a reticular layer which is thick and provides structural elasticity.  

There are mainly three kinds of UV light  

  • UV-A: wavelength is between 400 to 300nm.
  • UV-B: Wavelength is between 290 to 270nm.
  • UV-C: Wavelength is between 100 to 270nm.

These lights have a different wavelength. UV-C has the shortest wavelength and UV-A has the longest wavelength. To penetrate deeper part of the skin requires the longer length. Because of this UVA is used and have an ability to penetrate the dermis layer of the skin. This is the most dangerous radiation.

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Answer Details:

Grade: High School

Subject: Biology

Topic: UV Radiation

Keywords:

Wavelength, penetrate, skin, epidermis, dermis, shortest, longest, light, between, reticular layer, papillary layer, keratinocytes, thick skin.

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