Objects underwater appear Study guides, Class notes & Summaries
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SDI OPEN WATER SCUBA DIVER EXAM + QUESTIONS
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How big do Objects under water appear 
Objects appear 33% larger underwater. 
How far away do objects appear underwater? 
Objects appear 25% closer. 
How much faster does sound travel in water, compared to air? 
4 times 
How fast does Water conduct heat away from your body 
25 times faster than air does 
As you descend what happens to colors and which colors? 
colors fade, reds and oranges fade first, 30 meters seem blue and gray 
At what water temp does your body need thermal protection 
< 8...
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Study Guide: SDI Scuba Certification Exam Study Guide: Questions & Answers: Latest Updated: Guaranteed APlus Guide
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Name 3 different devices that modern dive computers replace 
(Ans- 
 1) dive tables 
2) J-valves 
3) depth gauges 
 
What sets SDI apart from other training agencies? 
 (Ans- First dive training agency to provide entry level scuba instruction that incorporates the use of personal dive computers --> more streamlined scuba course w/ more instruction time in the water 
 
How much larger and closer do objects appear underwater and why? 
(Ans- Objects underwater appear 25% larger and 25% closer...
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Questions and Answers from SDI Quizzes WITH CORRECT ANSWERS
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Questions and Answers from SDI Quizzes WITH CORRECT ANSWERS 
current: ch 1 - 15 
 
Objects underwater appear: - ANSWER-both closer and larger than they do on land 
 
What happens to colors as you descend? - ANSWER-they appear to fade 
 
How much faster does sound travel in water, compared to air? - ANSWER-four times as fast 
 
Water conducts heat away from your body... - ANSWER-25 times faster than air does 
 
T/F: A thermocline is the boundary between layers of fresh and salt water. - ANSWER-F...
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SDI OPEN WATER SCUBA DIVER EXAM + Q'S
- Exam (elaborations) • 31 pages • 2024
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SDI OPEN WATER SCUBA DIVER EXAM + Q'SHow big do Objects under water appear 
Objects appear 33% larger underwater
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SDI Open Water Scuba Diver Exam + Q's and correct answers
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SDI Open Water Scuba Diver Exam + Q's 
and correct answers 
How big do Objects underwater appear 
Objects appear 33% larger underwater. 
How far away do objects appear underwater? 
Objects appear 25% closer. 
How much faster does sound travel in water, compared to air? 
4 times 
How fast does Water conduct heat away from your body 
25 times faster than air does 
As you descend what happens to colors and which colors? 
colors fade, reds and oranges fade first, 30 meters seem blue and gray 
At wh...
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SDI Scuba Certification Exam Study Guide With Correct Answers | 100% Verified
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Define SCUBA - S - self 
C - contained 
U - underwater 
B - breathing 
A - apparatus 
List 3 important scuba diving changes that occurred in 1950s - 1) published USN dive tables 
2) invented the personal dive computer 
3) equipment manufacturers made improvements to the design and workmanship of gear 
Name 3 different devices that modern dive computers replace - 1) dive tables 
2) J-valves 
3) depth gauges 
What sets SDI apart from other training agencies? - First dive training agency to provide...
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SDI SCUBA CERTIFICATION EXAM 2024 WITH 100% CORRECT ANSWERS
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SDI SCUBA CERTIFICATION EXAM 2024 WITH 100% CORRECT ANSWERS 
 
Define SCUBA - correct answer S - self 
C - contained 
U - underwater 
B - breathing 
A - apparatus 
 
List 3 important scuba diving changes that occurred in 1950s - correct answer 1) published USN dive tables 
2) invented the personal dive computer 
3) equipment manufacturers made improvements to the design and workmanship of gear 
 
Name 3 different devices that modern dive computers replace - correct answer 1) dive tables 
2) J-...
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HESI A2 TEST BANK EXAM LATEST 2023
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HESI A2 
HESI A2 TEST BANK 
QUESTIONS & ANSWERS (100% APPROVED) 
BEST VERSION 2023 
 
CONGRATULATIONS! By deciding to take the Health Education Systems (HESI A2) Exam, you 
have taken the first step toward a great future! Of course, there is no point in taking this 
important examination unless you intend to do your very best in order to earn the highest 
grade you possibly can. That means getting yourself organized and discovering the best 
approaches, methods and strategies to master the ...
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SDI FINAL EXAM 2024 WITH 100% CORRECT ANSWERS
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SDI FINAL EXAM 2024 WITH 100% CORRECT ANSWERS 
 
 
Objects under water appear: 
1: The same size as they do on land. 
2: Twice as large as they do on land. 
3: Closer and larger than they do on land. 
4: Smaller and farther away than they do on land. - correct answer Closer and larger than they do on land. 
 
As you descend: 
1: Colors appear to fade. 
2: Reds and oranges are among the first colors to disappear. 
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. ...
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SDI Scuba Certification Exam Study Guide 2024 Questions with 100% Correct Answers | Verified | Latest Update 20242025
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1.	Define SCUBA 
ANS S - self C - contained 
U - underwater B - breathing A - apparatus 
2.	List 3 important scuba diving changes that occurred in 1950s 
ANS 1) published USN dive tables 
2)	invented the personal dive computer 
3)	equipment manufacturers made improvements to the design and workmanship of gear 
3.	Name 3 different devices that modern dive computers replace 
ANS 1) dive tables 
2)	J-valves 
3)	depth gauges 
4.	What sets SDI apart from other training agencies? 
ANS First dive train...
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