How Do You Calculate Photon Flux on a Surface?

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SUMMARY

The discussion focuses on calculating photon flux on a surface illuminated by a constant intensity of 10 W/m² at a wavelength of 600 nm. The relevant equations include E=hv, where E is energy, h is Planck's constant, and v is frequency, and the photon flux formula, which is flux=N/t=P/hv. The intensity provided allows for direct calculation of the photon flux without needing to derive it from the source power, as the intensity is already specified.

PREREQUISITES
  • Understanding of Planck's constant and its application in photon energy calculations
  • Familiarity with the relationship between intensity, power, and photon flux
  • Knowledge of electromagnetic wave properties, specifically wavelength and frequency
  • Basic grasp of energy calculations in physics
NEXT STEPS
  • Study the derivation of photon energy using E=hv and its implications in quantum mechanics
  • Explore the concept of intensity in electromagnetic waves and its calculation
  • Learn about the relationship between wavelength, frequency, and photon flux
  • Investigate practical applications of photon flux calculations in fields such as photonics and optics
USEFUL FOR

Students in physics, researchers in photonics, and professionals working with light intensity and photon calculations will benefit from this discussion.

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Homework Statement


An area of 2 sq. meter is lit with power 10W/m^2 with light on wave length equal to 600nm.
What is the photon flux that HIT the 2 sq. meter surface.


Homework Equations


E=hv - plank const and frequency (c/lambda)
Photon flux of EMITTED source is flux=N/t=P/hv


The Attempt at a Solution


It seems, that somehow the emitted flux P/hv has to be connected with flux that hit the surface...
 
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It seems that the question is stated in terms of the intensity of light on the surface (a constant 10W/(m^2) - note that this is INTENSITY, not power). In this case there is no need to calculate the intensity of light falling on the surface from the power of the source - it is given in the question. In that case, it is simply a matter of finding the number of photons in the 20 Joules that reach the surface each second from the Planck's constant relation given, E=hc/l.
 

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