Question

Sound waves can be used to measure ocean depth. This is done by sending a sound wave to the floor of the ocean and recording the time it takes to return to a machine. What did the inventor of this machine need to know while developing the machine?

A.The speed of water waves.
B.The speed of sound waves in water.
C.The speed of light waves in water.
D.The speed of sound waves in air.

Answer 1

@roadjester

Answer 2

This would be sonar. So a sound wave is sent out of the machine in water. Water needs a medium in which to travel so in this case the medium is water.

Answer 3

Oops, I mean sound needs a medium to travel, not water sorry

Answer 4

SO THEN THE ANSWER IS B OR C?

Answer 5

Good, you're eliminating the incorrect answers.
So, there are different types of waves. There are electromagnetic waves, which is light.
Then you have sound waves. So, if you're in water such as a submarine, you're going to have lights on in order to see. Those EM waves aren't coming back through reflection. So do you think it's B or C?

Answer 6

THEN THE ANSWER IS B?

Answer 7

yup

Answer 8

THANK YOU VERY MUCH :)