An observer sits in front of a speaker attached to a spring. The speaker oscillates with an amplitude of 0.500 m and reaches a minimum distance of d = 1.00 m from the observer. The mass of the speaker is m = 9.0 kg and the spring constant is k = 22.0 N/m. The speaker emits a pure 350.0 Hz tone as it oscillates in simple harmonic motion. The speed of sound in air is v = 343 m/s.