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Math·Advanced Math·Nonlinear functions

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The function $f(x)=900(0.5{)}^x$ gives the predicted intensity of a beam, in number of photons in the beam, $x$ millimeters below the surface of a certain material. What is the best interpretation of $f(12)=450$?

A

A beam at the surface of the material has a predicted intensity of 12 photons in the beam.

B

A beam at the surface of the material has a predicted intensity of 450 photons in the beam.

C

A beam 12 millimeters below the surface of the material has a predicted intensity of 450 photons in the beam.

D

A beam 450 millimeters below the surface of the material has a predicted intensity of 900 photons in the beam.