Author Question: How is sound transmitted through a medium? a. By rapid vibrations of molecules b. By rapid ... (Read 72 times)

swpotter12 · **on:** Aug 22, 2018

How is sound transmitted through a medium?
a. By rapid vibrations of molecules
b. By rapid temperature changes in a medium
c. By rapid pressure changes in a medium
d. By rapid random movements

Question 2

What is the main reason for the stratification in the north polar waters?
a. Temperature
b. Salinity
c. Depth
d. Pressure

adf223 · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

ANS: C
Sound energy is spread by rapid pressure changes. Sound's intensity decreases as it moves through
seawater due to scattering, spreading and absorption. Information can be found in the section Sound
Travels Much Farther Than Light through the Ocean.

Answer to Question 2

ANS: B
Vertical movement is quite limited in polar and tropical waters. The layers in the polar regions are
mostly due to changes in salinity as there is generally no thermocline. Information can be found in the
section The Ocean Is Stratified by Density.