An ultrasonic distance sensor is fixed above a metal plate. The plate is raised towards the sensor in equal steps. At each position the plate is held still, and the sensor sends one pulse through the air towards the plate and detects the reflected pulse.
The speed of ultrasound in air is 340 m/s.
| Position number | Echo time in ms\mathrm{ms}ms |
|---|---|
| 1 | 18.0 |
| 2 | 17.4 |
| 3 | 16.8 |
| 4 | 16.2 |
The plate continues to be raised by the same step each time. Calculate the distance between the sensor and the plate at position 6.