Why Does UV Light Cause Sunburn But Visible Light Does Not?

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SUMMARY

UV light causes sunburn due to its higher photon energy compared to visible light, which does not cause such damage. The discussion highlights the relationship between the electromagnetic spectrum and the energy of photons, emphasizing that UV photons possess sufficient energy to damage organic molecules in the skin. This damage leads to the biological response known as sunburn. The photoelectric effect is referenced as a key concept, illustrating that the frequency of light, rather than its intensity, determines its ability to cause electron release and subsequent molecular damage.

PREREQUISITES
  • Understanding of the electromagnetic spectrum
  • Knowledge of photon energy and its effects
  • Familiarity with the photoelectric effect
  • Basic concepts of organic molecular damage
NEXT STEPS
  • Research the electromagnetic spectrum and its various regions
  • Study the photoelectric effect in detail
  • Explore the biological mechanisms of UV-induced skin damage
  • Investigate protective measures against UV radiation
USEFUL FOR

Students studying physics or biology, educators teaching about light and its effects, and individuals interested in understanding sunburn and UV radiation's impact on skin health.

clarkandlarry
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Homework Statement



UV light causes sunburn, whereas visible light does not. Explain.

Homework Equations



N/A

The Attempt at a Solution



I'm guessing that it might have sinething to do with the electromagnetic spectrum.
 
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Probably. Since it's electromagnetic. Might have something to do with the energy of photons as well. Can you give this a little more thought?
 
Is it because in UV light, the energy of the photons is much greater than the energy of photons in visible light?
If so, why does the energy of the photons have anything to do with getting sunburn?
 
Because sunburn is caused bythe photons causing damage to organic molecules. What might 'causing damage' have to do with the energy of the photons? Think photoelectric effect.
 
lol... photelectric effect, bits of my skin being imparted with energy and flying off my body?
 
"Photoelectric effect" as in some processes require a minimum photon energy to proceed.
 
You have probably seen a demonstration of the photoelectric effect once, where your teacher shines a lamp on a cathode/anode device. You might remember that not the intensity, but the frequency (color) of the light was what decided if and how much electrons are released. The same concept applies here.
 

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