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A small speaker of mass 3 kg is swinging as a simple pendulum on the rope of length 0.9 m while emitting a sound of a single frequency f and power 101 W. When the pendulum is at the end of its swing: 0 radians from vertical position (the furthest away from the equilibrium), the speaker sound is exactly matched by the sound produced by 550-harmonic of the string of length 0.9 m. Given the speed of sound in the air (v=340m/s) Find the maximum and laundess (in dB) of the sound detected by a person 22 meters away from the pendulum suspension point.

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