1. Show that when averaged over the +z hemisphere the average value of cos θ is 1/2, where…

1. Show that when averaged over the +z hemisphere the average value of cos θ is 1/2, where θ is the angle with the +z axis. How is this relevant to the calculation of photon flux?

2. Why do building codes in some cold climates permit twice the window area for double-paned glass?

 

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