Exam (elaborations) SSI open water

Which of the statements concerning sound transmission underwater is incorrect? -Sound will travel farther underwater then in air -Divers find it difficult to locate the direction of a sound producing source -Divers find it easy to talk to each other directly through water -Sound travels four times faster underwater than in air correct answer-Divers find it easy to talk to each other directly through water The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is: -2 ata -1 ata - 4 ata - 3 ata correct answer2 ata The condition in which certain colors are diminished as depth increases is called: -Refraction -Turbidity -Diffusion -Absorption correct answerAbsorption Earplugs -Aid equalization of the middle of the ear - Protect against cold -Should never be worn while diving -Protect ears from squeeze correct answer-Should never be worn while diving Gauge pressure is defined as: - Hydrostatic pressure minus 1 ata - The pressure at the surface - The depth reading on a gauge - Absolute pressure minus 1 ata correct answer- Absolute pressure minus 1 ata Sinus squeeze can be prevented by: -Valsalva technique - Wearing earplugs - Tilting the divers head back and forth - Not diving with a cold correct answer- Not diving with a cold The event that led to the use of the acronym SCUBA to describe diving was: correct answerThe development of the demand regulator in 1943