SDI International Scuba Diving Chapters 1-5 exam with correct answers

What does "SCUBA" stand for in scuba diving? self-contained underwater breathing apparatus List the three important scuba diving changes that occurred in the 1950s? 1. No full body suits 2. Published dive tables 3. Equipment changes Name three different devices that modern dive computers replace? 1. Removal of the J valve 2. Gauges were combined 3. Depth, time, Pressure What sets Scuba Diving International apart from other training agencies? Allows to be ready for new technology and it is still done all by computer How much larger and closer do objects appear underwater and why? 25% and Refraction causes objects in water to appear closer How much faster does sound travel in water than air? X4 faster than on land because of water density What is the first color to be absorbed under water? Red When diving from shore, the best time to dive is when there is the least amount of tidal current. _____ tide is when there is no horizontal water movement? Slack