The function $f$ models the intensity of a beam, $f(x)$, in number of…

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f (x) = 1, 300 (0.5)^{\frac{x}{14}}

The function

f

models the intensity of a beam,

f (x)

, in number of photons,

x

millimeters below the surface of a certain material. According to the model, what is the number of photons in the beam when it is at the surface of the material?

1,300