Which sensitivity value is most sensitive?

To determine which sensitivity value is most sensitive, it's important to understand how to convert the given units so they can be compared. Sensitivity in measurements refers to the smallest change in the input that results in a perceptible change in the output.

The choices given are in different units: microunits (uV), millivolts (mV), millimeters (mm), and centimeters (cm).

When comparing sensitivity values, the smaller the microvolt or millivolt value (per unit distance), the more sensitive the measurement is, as it can detect smaller signals.

Examining the choices:

• 2 uV/mm is equal to 0.002 mV/mm, meaning it can detect changes as small as 0.002 mV for each mm.

• 5 mV/cm can be converted to 0.5 mV/mm (since 1 cm = 10 mm), indicating it detects changes of 0.5 mV per mm.

• 5 uV/mm indicates sensitivity to changes as small as 0.005 mV/mm.

• 2 mV/mm is much less sensitive as it can only detect changes of 2 mV per mm.