A block with a speaker bolted to it is connected to a spring having spring constant k = 21.0 N/m, as in Figure P17.40. The total mass of the block and speaker is 46.00 kg, and the amplitude of this unit's motion is 0.475 m. Assume that the speed of sound is 343 m/s. Figure P17.40 (http://www.webassign.net/pse/p17-38.gif) (a) If the speaker emits sound waves of frequency 470 Hz, determine the highest and lowest frequencies heard by the person to the right of the speaker to the nearest 0.01 Hz. Hz (highest) Hz (lowest) (b) If the maximum sound level heard by the person is 66.0 dB when he is closest to the speaker, 1.00 m away, what is the minimum sound level heard by the observer? dB Was thinking you would have to use f'=(v -v0 / v) but that won't work. Not sure how to fit in the given values such as the spring constant and the amplitude. Please help!!