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Two loudspeakers radiate in phase at 170 H_(Z) . An observer sits at 8 m from one speaker and 11 m from the other . The intensity level from either speaker acting alone is 60 dB . The speed of sound is 340 m//s . (a) Find the observer intensity when both speakers are on together. (b) Find the observer intensity level when both speakers are no together but one has its leads reversed so that the speakers are 180^(@) out of phase. (c ) Find the observer intensity level when both speakers are on and in phase but the frequency is 85 H_(Z) .

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Sound waves from a loudspeaker spread nearly uniformly in all directions if the wavelength of the sound is much larger than the diameter of the loudspeaker. (a) Calculate the frequency for which the wavelength of sound in air is ten times the diameter of the speaker if the diameter is 20 cm. (b) Sound is essentially transmitted in the forward direction if the wavelength is much shorter than the diameter of the speaker. Calculate the frequency at which the wavelength of the sound is one tenth of the diameter of the speaker d- iescribed above. Take the speed of sound to be 340 m s^-1 .

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Sound with intensity larger than 120 dB appears painful to a person. A small speaker delivers 2.0 W of audio output. How close can the person get to the speaker without hurting his ears ?