The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.939 W/m2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. How much total electromagnetic energy falls on the area during 1.0 minute
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grav forces affect all objects magnetic forces affect magnetic objects and electric currents
This is what a calorimeter is used for simpler ex, to measure calories in food.
The total energy is [tex]T = 169.02 \ J[/tex]
From the question we are told that
The Poynting vector (energy flux ) is [tex]k = 0.939 \ W/m^2[/tex]
The length of the rectangle is [tex]l = 1.5 \ m[/tex]
The width of the rectangle is [tex]w = 2.0 \ m[/tex]
The time taken is [tex]t = 1 \ minute = 60 \ s[/tex]
The total electromagnetic energy falls on the area is mathematically represented as
[tex]T = k * A * t[/tex]
Where A is the area of the rectangle which is mathematically represented as
[tex]A= l * w[/tex]
[tex]A= 2 * 1.5[/tex]
[tex]A= 3 \ m^2[/tex]
[tex]T = 0.939 * 3 * 60[/tex]
[tex]T = 169.02 \ J[/tex]