10) A fisherman uses sonar to find a shoal of fish. A pulse of ultrasound is sent out and the reflection is detected 0.4 seconds later.
a. How long did it take the sound to travel from the boat to the fish?
0.2 seconds
b. The seed of sound in water is 1500 m/s. How far below the boat are the fish?
Given: v = 1500 m/s t = 0.4 s
Asked: How far below the boat are the fish?
Formula: v= s/t s= v * t
Calcualtion: s = 0.2 * 1500 = 300 m
Answer: The fish are 300 meter below the boat.
c. Somtimes fisherman will see another signal on the sonar after they dected the echo from the fish. Why? The sound pulse can hit another. schoal of fish, reflecting another echo.