III.- Solve the (“Parallel Exercises, Group B”) problems below:
1.- A water wave has a frequency of 6 Hz and a wavelength of 3 m.
7.- A submarine sends a sonar signal, which returns from another ship 2.250 s later. How far away is the other ship if the speed of sound in seawater is 1,530.0 m/s?
9.- You see condensed steam expelled from a ship’s whistle 2.50 s before you hear the sound. If the air temperature is 20.0 °C, how many meters are you from the ship?
14.- Sound from the siren of an emergency vehicle has a frequency of 750.0 Hz and moves with a velocity of 343.0 m/s. What is the distance from one condensation to the next?
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