Physics

Problem

The speed of sound in sea water is

1490\,\text{m/s}

25^{\circ}\text{C}

and

1530\,\text{m/s}

35^{\circ}\text{C}

. A submarine records an echo time of

1.0\,\text{s}

35^{\circ}\text{C}

. By how many metres would the calculated depth differ from a calculation made at

25^{\circ}\text{C}

using the same time delay? a)

40\,\text{m}

deeper b)

20\,\text{m}

shallower c)

20\,\text{m}

deeper d) No difference