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

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SUMMARY

UVA radiation penetrates deeper into the skin than UVB radiation due to its longer wavelength, despite having lower energy and intensity. The relationship between energy and wavelength, defined by the equation E=hv=hc/λ, explains this phenomenon. The discussion highlights the need for a deeper understanding of the physics behind light penetration in biological tissues, emphasizing the importance of wavelength in determining skin penetration depth.

PREREQUISITES
  • Understanding of electromagnetic radiation and its properties
  • Familiarity with the concepts of wavelength and energy
  • Basic knowledge of skin biology and its layers
  • Awareness of the differences between UVA and UVB radiation
NEXT STEPS
  • Research the biological effects of UVA and UVB radiation on skin cells
  • Study the physics of light absorption in biological tissues
  • Explore the applications of UV radiation in dermatology
  • Learn about protective measures against UV radiation exposure
USEFUL FOR

Individuals interested in dermatology, physicists studying light interactions with biological materials, and anyone seeking to understand the effects of UV radiation on skin health.

finnch
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[Mentor's Note: Thread moved from New Member Introductions]

Hello,

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...
 
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Hi finnch. :welcome:

Yours is a good question, though you won't get an answer to it in this part of Physics Forums. :oldfrown:

To understand why, please refer to the response I wrote in an earlier thread here: https://www.physicsforums.com/threads/pipe-diameter-increase.819442/#post-5143656
 

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