Question

Sonar (or Sound Navigation and Ranging) uses sound propagation to communicate or detect objects on the surface or under the water. It is a bit of a double-edged sword as if you are actively searching for a target, the target can detect that and potentially find you faster. During wargames between two nations, two submarines are underwater moving directly away from each other. Sub A has a speed of v_A = 9.50 m/s and Sub B has a speed of v_B = 7.75 m/s. Sub A sends out a 1550 Hz sonar wave that travels at a speed of v = 1520 m/s (a) Draw an approximate picture of the situation. (b) What is the frequency detected by Sub B? (c) What is the wavelength of this wave? (d) If part of the wave is reflected back from Sub B to Sub A at 80% of the speed. What is the frequency detected by Sub A? (e) What is the wavelength of this wave?

          Sonar (or Sound Navigation and Ranging) uses sound propagation to communicate or detect objects on the surface or under the water. It is a bit of a double-edged sword as if you are actively searching for a target, the target can detect that and potentially find you faster. During wargames between two nations, two submarines are underwater moving directly away from each other. Sub A has a speed of v_A = 9.50 m/s and Sub B has a speed of v_B = 7.75 m/s. Sub A sends out a 1550 Hz sonar wave that travels at a speed of v = 1520 m/s
(a) Draw an approximate picture of the situation.
(b) What is the frequency detected by Sub B?
(c) What is the wavelength of this wave?
(d) If part of the wave is reflected back from Sub B to Sub A at 80% of the speed. What is the frequency detected by Sub A?
(e) What is the wavelength of this wave?

Sonar (or Sound Navigation and Ranging) uses sound propagation to communicate or detect objects on the surface or under the water. It is a bit of a double-edged sword as if you are actively searching for a target, the target can detect that and potentially find you faster. During wargames between two nations, two submarines are underwater moving directly away from each other. Sub A has a speed of vA = 9.50 m/s and Sub B has a speed of vB = 7.75 m/s. Sub A sends out a 1550 Hz sonar wave that travels at a speed of v = 1520 m/s
(a) Draw an approximate picture of the situation.
(b) What is the frequency detected by Sub B?
(c) What is the wavelength of this wave?
(d) If part of the wave is reflected back from Sub B to Sub A at 80% of the speed. What is the frequency detected by Sub A?
(e) What is the wavelength of this wave?

Added by Victor Manuel J.

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