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Acoustical proximity sensors react to ______________________________.

Sound sensors rely on ____ to convert sound to electrical energy.

When current is flowing in an electrical circuit, ______________________________ opposes changes in current.

Choose the best vocabulary word for the sentence:  I don’t prefer to listen to ____________________ music.  I like the oldies like Elvis Presley and The Beatles.

A(n) ______________________________ sensor determines the precise distance from the sensor to an object.

The categories of opto-electronic devices include ____.

A(n) ____ has more than one end effector that can be changed when needed to execute operations.

A(n) ____ transducer measures movement and creates signals that affect current flow.

The rotary motion of shafts, gears, and pulleys is measured by ____ sensors.

Wavelengths of light are measured in ____.