Final answer:
The depth of the reflector is calculated using the go-return time of the sound wave and the speed of sound in the medium. For a go-return time of 39 microseconds and assuming a typical speed of sound in soft tissues of 1540 m/s, the depth is found to be 3 cm.
Step-by-step explanation:
To calculate the depth of the reflector using the go-return time of a sound wave, we must know the speed of sound in the medium, as well as the fact that the sound wave has to travel to the reflector and back. Typical speed of sound in soft tissues is around 1540 m/s. However, since the medium is not specified, we'll use this value as a general reference.
The formula to find the depth is:
Depth (d) = (Speed of Sound in Medium (v) × Time (t)) / 2
Assuming the speed of sound is 1540 m/s and the go-return time is 39 microseconds (us), which is 39 × 10^-6 seconds, the calculation would be:
Depth = (1540 m/s × 39 × 10^-6 s) / 2
Depth = (1540 m/s × 0.000039 s) / 2
Depth = 0.03003 meters
Depth = 3 cm
Therefore, the depth of the reflector is 3 cm, which corresponds to option (b).