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Math·Advanced Math·Nonlinear functions

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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?

A

2

B

13

C

14

D

1,300