Question

An ion in a mass spectrometer follows a semicircular path of radius 14.8. What is the distance it travels?

Answer 1

Is there a time frame in which it travels?

Answer 2

The circumference of a circle is (2π · the circle's radius).

The length of a semi-circle is  (1π · the circle's radius) =

                                                 (π · 14.8) = 46.5 (rounded)

(The unit is the same as whatever the unit of the  14.8  is.)