A. Multiple Choice
1. A ship sends a sound wave to the sea floor and receives the echo after 4 seconds. If the speed of sound in seawater is 1500 m/s, what is the depth of the sea?
A. 1500 m
B. 3000 m
C. 6000 m
D. 750 m
2. Why is the time measured in sonar divided by 2 when calculating the depth of the sea?
A. Because sound moves slower in water
B. Because the sound travels only downward
C. Because the sound travels down and then back up
D. Because the sound is reflected many times
3. A sonar pulse takes 2 seconds to return to the ship. The speed of sound in seawater is 1400 m/s. What is the depth of the sea?
A. 700 m
B. 1400 m
C. 2800 m
D. 5600 m
B. Essay Questions
3. A ship sends a sound signal to the bottom of the sea. The echo is received after 6 seconds. If the speed of sound in seawater is 1500 m/s, calculate the depth of the sea.
4. A sonar wave is sent from a ship and the echo is received after 8 seconds. If the speed of sound in seawater is 1500 m/s, calculate the depth of the sea and explain your steps.
5. Explain how sonar is used to measure the depth of the sea.
