Question 2: Two submarines are underwater: Sub A is at rest and Sub B is approaching Sub A with a speed of 24.0 m/s. Sub A sends out a 26,500 Hz sonar (sound) wave that travels at a speed of 1530 m/s. (1+vlistener) Both moving; f' : fw Upper sign: towards (1 i 50W\") Lower Sign: away 1"sound a) Draw a diagram showing both submarines and the sound wave being emitted by Sub A. Indicate the directions of the wave velocity and the velocity of Sub B. b) What is the frequency of the sonar wave detected by Sub B? c) When the sonar wave reaches Sub B it is reflected straight back to Sub A. Draw a diagram of both submarines and the reflected wave. Indicate the directions of the wave velocity and the velocity of Sub B. (Note: Reflection from a moving object is equivalent to the object re- emitting the wave with the frequency detected, so it acts like a moving wave source.) d) What frequency does Sub A detect for the reflected wave