FAQ

What is the Elapse Time t1?
Elapse Time t1 is the ultrasonic sound sent by A received at B after a certain time. Elapse Time t1 is usually measured using the Second for Time. Note that the value of Elapse Time t1 is always positive.
Can the Elapse Time t1 be negative?
No, the Elapse Time t1, measured in Time cannot be negative.
What unit is used to measure Elapse Time t1?
Elapse Time t1 is usually measured using the Second[s] for Time. Millisecond[s], Microsecond[s], Nanosecond[s] are the few other units in which Elapse Time t1 can be measured.
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