Question 5 1 pts Two in-phase speakers Si and $2 emit sounds with frequency 200 Hz. Speaker S, is at the origin and $2 is at a position 20 m away from the origin, as shown in the picture. Speed of sound is 340 m/s. What is the wavelength [ Select ] Y of the sound? A person starts at the origin and slowly walks towards $2. When the person is half-way between S1 and $2, what kind of interference [ Select ] Y does the person hear? S2 O 20 m