An ultrasonic detector is placed against the top of a layered ceramic panel. A pulse travels through the uniform upper layer, reflects at the boundary with the layer below, and returns to the detector. The detector records the following data:
| Measurement | Value |
|---|---|
| Speed of the pulse in the upper layer | 3.2 × 103 m/s |
| Time from sending the pulse to detecting its echo | 3.75 × 10-5 s |
Calculate the thickness of the upper layer.