What Does P Represent in Intensity = P/Area?

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In the equation Intensity = P/Area, P represents Power. The discussion also touches on Max Planck's contribution to quantum mechanics, highlighting that he proposed energy is quantized. The equation E = nhf illustrates this concept, where E is energy, n is a quantum number, h is Planck's constant, and f is frequency. Participants express gratitude for clarifying the meaning of P and its relevance to the topic. Understanding these concepts is essential for grasping the principles of thermal radiation and quantum theory.
Maddie1609
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Hello!

I just started learning about Stefan-Boltzmann's law and I'm stuck on the word for P in Intensity = P/Area.

Also, does anyone have a quick and easy explanation for how Max Planck started quantum mechanics by saying energy is quantized and how the equation E = nhf says so?
 
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Maddie1609 said:
I just started learning about Stefan-Boltzmann's law and I'm stuck on the word for P in Intensity = P/Area.
How about Power!
 
Doc Al said:
How about Power!
Oh lord ha ha, thank you!
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
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