An ultrasonic transmitter of frequency 40kHz operates continuously for 0.20s. The sound travels 300m through water (speed 1500m/s) and then 300m through steel (speed 5100m/s) before reaching a receiver.
(i) Calculate the total number of oscillations produced during the 0.20s of operation.
(ii) Determine the time taken for the sound to reach the receiver after it is emitted.