What is the best interpretation of \(f(17) = 600\)?

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The function

f (x) = 1, 200 (0.5)^{\frac{x}{17}}

gives the predicted intensity of a beam

f (x)

, in number of photons in the beam,

x

millimeters below the surface of a certain material.

What is the best interpretation of

f (17) = 600

A beam at the surface of the material has a predicted intensity of

17

photons in the beam.

A beam at the surface of the material has a predicted intensity of

600

photons in the beam.

A beam

17

millimeters below the surface of the material has a predicted intensity of

600

photons in the beam.

A beam

600

millimeters below the surface of the material has a predicted intensity of

1, 200

photons in the beam.