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Wal (the manager of the local MalWart store) has set up two speakers to play music. One speaker is inside the open doorway and the other is outside....
Wal (the manager of the local MalWart store) has set up two speakers to play music. One speaker is inside the open doorway and the other is outside. Each is 0.500 m from the store wall as shown and both speakers are driven from the same coherent sound source.
a) Does a customer standing at A hear constructive or destructive interference? Explain.
b) The customer at A moves to D. What is the lowest possible frequency for which the customer will hear destructive interference?
c) The outside speaker emits 1.5 W of sound energy uniformly in all directions. With the door closed so the inside speaker is inaudible, another customer approaches. When he is 2.00 m away from the speaker, what intensity of sound will he hear? What is the sound intensity level of this sound in dB?
