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UVA/UVB Light: Why does UVA penetrate deeper into the skin?

  1. Jun 17, 2015 #1
    [Mentor's Note: Thread moved from New Member Introductions]


    My name is Chris and I am trying to understand why UVA radiation, with a longer wavelength, penetrates deeper into the skin than UVB which has a shorter wavelength.

    Since E=hv=hc/ λ and c44eb3c2af933606f2bb928132d7ec21.png

    then how does a lower energy and lower intensity UVA wave penetrate deeper into the skin than a UVB wave?

    Pardoning the pun, I would appreciate it if someone could enlighten me :eek:)

    Many thanks...
    Last edited by a moderator: Jun 18, 2015
  2. jcsd
  3. Jun 17, 2015 #2


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    Staff: Mentor

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