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Question
how the energy of light that is responsble for the intensity of light is different than that for the frequency of the light?
how intensity and frequency of light are related together?
Versha,
light consists of photons, which are energy quanta. Energy of a single quantum is related to the frequency of the light by Planck's law E_ph = h*f_ph, where h is the Planck's universal constant.
Intensity of light is defined as the number of photons N per unit area A, per unit time T, so that:
I = N/(T*A). Intensity thus defined has nothing (!) to do with the frequency of light.
There is something called Radiative Power Density, which is the product of intensity and energy of a single photon quantum, P = I*E_ph. This quantity joins he two and it is useful in wireless communications and radiology.
Cheers,
Daniel
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Daniel Mazur
Expertise
Questions anyone (teenager, undergrad, graduate, professional) may ask on physics, mathematics or inorganic chemistry. Questions may concern subjects themselves or a possible future career in them, if you need advice on a school or hobby project, or you just came across a question that is beyond your current curriculum. I answer bare textbook problems sometimes, but I reserve the the right to redirect you to Physics-Physics section. The kind of questions I like to answer: I just started having science classes at school and they seem difficult, but I enjoy them. Where do I find more information on this, which is not in textbooks but still comprehensible to me? Just leaving high school, and I feel science is really the thing for me. Can you recommend a school and an undergrad program suitable to my inclinations? I am in my second undergraduate year in Physics. We learned the basics of universe expanding this year, the Hubble constant and all that, but invited speakers that gave talks on astrophysics in our department seemed not to agree with this model at all. Is it of any use at all? I am building a [materials research] experimental device for my masters/doctorate thesis and I have the following problem:... I have tried ..., but it still doesn't work. Where might the problem be?
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