Two Source Interference Two speakers are placed 2 m apart and are emitting sound waves in phase with each other, both with frequency f = 260 Hz. Jack is standing a distance r from top speaker, at a perpendicular distance from the line of speakers, as shown. The speed of sound in air is 344 m/s. X O 2 m O(a) If Jack starts near the top speaker and walks to the left, how far is he from the top speaker (x =?) the first time he can't hear any sound? (b) If he keeps walking, how far to the left of the top speaker should he stand to hear the first "loud spot," where there is perfect constructive interference? (c) If Jack is standing a distance r = 3.5 m from the top speaker, what is the phase difference between the two sound waves that reach him? (d) If Jack wanted to have a point of completely constructive interference at r = 3.5 m, what is the smallest frequency of sound waves that the speakers could emit? (e) Assume that the second speaker stops working and only the top speaker is still emitting sound. At r = 3.5, Jack measures the sound's intensity to be /1 = 2.5 x 10-4 W/m. What is the intensity of the sound from the first speaker at the location of the second (non-working) speaker