This may seem like a very basic question, but...

Since light exhibits two properties, can light intensity be thought of as the amplitude when it's a wave, and the number of particles present in a certain area when it's a particle?

Thanks!!!

Yes.

I read something about the amplitude of the wave. It said that the amplitude of a wave shows how much energy the wave has, which in turn suggests that intensity is related to energy. But isn't the energy of light related to the frequency?

Energy is related to frequency. Energy and Intensity have nothing to do with each other. Your source is all screwed up.

Depends on what you mean by "intensity". Wikipedia says there are four ways you can define it. Which do you mean?

The energy of individule photons is related to frequency, but the intensity is a measure of the energy of a light beam.

Well, I found out about the amplitude of a wave here: http://www.glenbrook.k12.il.us/gbssci/phys/Class/waves/u10l2c.html

Since amplitude also shows intensity, I want to know if intensity is related to energy.

I didn't know there are that many "intensities"...

Klaynos, what do you mean by "measure of the energy of a light beam"?

Well it's normally an average (over time) of the energy flux (that's energy/unit area).

I see... Thank you all for replying!

The energy of individule photons is related to frequency, but the intensity is a measure of the energy of a light beam.

 

I am currently struggling to understand this. Yeah... Anyone who wants to expand on it, I would be much obliged.

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I am currently struggling to understand this. Yeah... Anyone who wants to expand on it, I would be much obliged.

 

Looking around, I found one explanation that made sense to me. Frequency is associated with the energy of individual photons, and amplitude is associated with the number of photons per unit area. I guess that follows. A brighter light is more light... Huh, I hate how after wrestling with something it seems like it should have been obvious in the beginning. I 'toopid.

Yes.

 

I disagree. The intensity of light is not proportional to the amplitude but to the square of the amplitude.