1. If a submarine's sonar can measure echo times with a precision of 0.0100 s. a. What is the smallest difference in distances it can detect? (Assume that the submarine is in the ocean, not in
freshwater.) [5]
b. Discuss the limits this time resolution imposes on the ability of the sonar system to detect the size and shape
of the object creating the echo. [2]

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.