Question $8(1$ point$)$

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How is it possible for an ultrasonic proximity detector to medsure the distance to an object?

An ultrasonic proximity detector can be used to measure distance by measuring the time required for the echo to get to the object.

An ultrasonic proximity detector can be used to measure distance by measuring the time required for the echo to dissipate.

An ultrasonic proximity detector can be used to measure distance by measuring the time required for the echo to return.

An ultrasonic proximity detector can be used to measure distance by measuring the space required for the echo to return.