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Rebecca Doan 2L
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Postby Rebecca Doan 2L » Sun Oct 15, 2017 5:54 pm

What is meant by the intensity of a wave or the intensity of the light?

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Re: Intensity

Postby Chem_Mod » Sun Oct 15, 2017 6:05 pm

Intensity of light is simply the number of photons, however as we know the number of photons is not as relevant as each photons wavelength/frequency/energy while doing photoelectric effect problems.

Michelle Lee 2E
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Re: Intensity

Postby Michelle Lee 2E » Sun Oct 15, 2017 9:15 pm

How do we measure intensity? In the book on page 4, it says intensity is the square of the altitude. However, the above response defines intensity as the number of photons. Then on page 9, the Stefan-Boltzmann law is explained. How am I supposed to relate all this information?

Sophia Bozone 2G
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Re: Intensity

Postby Sophia Bozone 2G » Sun Oct 15, 2017 11:00 pm

In typical waves, intensity is measured as an increase in amplitude. Amplitude is the height of the waves, or the distance of the crests and troughs of waves from the midpoint or node. However, because light functions as a wave and proton, the amplitude does nothing to increase the amount of energy that the photon is carrying because it transfers energy in quanta.

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