WAVE 6.6 Analysing Sound Wave: Sonar

SONAR : TO DETERMINE THE DEPTH OF THE SEABED
1. Sonar: Sonar is reflection from an ultrasonic waves ( ultrasonic echoes)

• to locate underwater objects
• to measure the depth of a sea bed

2. Sonar using ultrasonic waves because :

• has higher frequency
• has more energy, so can move further
• do not produce noise

3. To measure the depth

Attach ultrasonic transmitter to a ship.Use a microphone receiver to detect ultrasonic pulses. Direct the ultrasonic pulses from the transmitter to the seabed. Use microphone receiver to pick up the reflected pulses from the seabed.
Measure the time taken by the pulses to travel to seabed and return. Calculate the depth of the water using the formula d=(v x t) / 2