At a depth of between about 1650 and ..... feet, a sound channel exists where sound waves can be tapped and also along which sound waves can travel for large distances.

EARTH SCIENCE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

At a depth of between about 1650 and ____ feet, a sound channel exists where sound waves can be tapped and also along which sound waves can travel for large distances.

A	2000
B	5000
C	2500
D	3300

Explanation:

Detailed explanation-1: -Because of SOFAR, sound emitted at a certain depth bounces between these various layers and can travel for hundreds of miles. This up-and-down bending of low-frequency soundwaves allows soundwaves to travel great distances without the signal losing significant energy.

Detailed explanation-2: -The sound speed minimum at a depth of 1000 meters is called the deep sound channel or, more historically, the SOFAR channel.

Detailed explanation-3: -The average speed of sound in seawater is 1, 500 m/s (3, 345 mph). Waves refract towards slower regions. Sound speed maxima (near 80m depth) causes sound to refract away.

Detailed explanation-4: -While sound moves at a much faster speed in the water than in air, the distance that sound waves travel is primarily dependent upon ocean temperature and pressure.

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