Physics · Oct / Nov 2025 · Paper 12 · Question 5

A ship uses ultrasound to measure the depth of the sea. There is a time interval of 0.52 s between transmitting and detecting a pulse of ultrasound. The speed of ultrasound in sea water is 1500 m / s. What is the depth of the sea?

1. A390 m
2. B780 m
3. C1600 m
4. D5800 m

As printed in the paper