Energy and water Pt. 2

Question 1

How much light is attenuated in costal waters at 10m

Answer 1

96%

Question 2

How much light is attenuated in costal waters at 15m

Answer 2

100%

Answer 3

Light penetrates deeper in water that contains less particles, and open-ocean water appears bluer than coastal waters.

Question 4

What is attenuation dependent of?

Answer 4

wavelength of light

Question 5

How is sound energy transmitted through water?

Answer 5

With ocean sounds, the energy is transmitted viawater molecules vibrating back and forth parallel to the direction of the sound wave, and passing on the energy to adjacent molecules.

Question 6

What is the average velocity of sound in seawater?

Answer 6

1500 m/s
(5000 ft/s)

Question 7

What is the average velocity of sound in dry air at 20c?

Answer 7

334 m/s (1100 ft/s)

Question 8

How do high frequency sounds interact with water?

Answer 8

They don’t penetrate far beneath the sea floor and are used simply to measure water depth.

Question 9

How do low frequency sounds interact with the ocean?

Answer 9

They penetrate the seafloor sediments and reflect from boundaries between sediment layers.

Question 10

What is a SOFAR channel?

Answer 10

natural sound channel in oceans in which sound can be transmitted for very long distances.